| 释义 |
- Length
- Area
- Volume
- Time
- See also
- Notes
- References Citations Bibliography
{{hatnote|'Erw' redirects here. For electronic-resistance welding, see ERW.}}Welsh units of measurement are those in use in Wales between the Sub-Roman period (prior to which the Britons used Roman units) and the 13th-century Edwardian conquest (after which English units were imposed). Modern Wales no longer employs these units even for customary purposes but instead follows the custom as elsewhere in Britain of using a mixture of metric and Imperial units. {{TOC limit|2}}LengthIn the Venedotian Code used in Gwynedd, the units of length were said to have been codified by Dyfnwal Moelmud but retained unchanged by Hywel Dda.{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA89 Book II, Ch. XVII, §2]}} The code provided for computing the units variously, as well as deriving them from grains of barley. In measuring milk and its legal worth ({{lang|cy|teithi}}), disputes over the length of the inch used in the container were to be resolved by the width of the judge's thumb.{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA133 Book III, Ch. VI, §11]}} The code notes that in some areas of Wales, the rod used to compute the Welsh acre ({{lang|cy|erw}}) was not reckoned from feet but taken to be "as long as the tallest man in the [tref], with his hand above his head".{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §2]}} - 3 barleycorns ({{abbr|Med.|Medieval Welsh}} {{lang|owl|gronẏn heẏd}}, {{abbr|Mod.|Modern Welsh}} {{lang|cy|heidden}}) = 1 inch{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}}{{refn|group=n|Roche gives this as computed the length of grains of barley rather than their width,{{sfnp|Roche|1998|p=25}} but this does not appear anywhere in the statutes and early reckoning elsewhere was by the width or breadth of the barleycorn.}}
- 3 inches (Med. {{lang|owl|moduet}}, Mod. {{lang|cy|modfedd}}) = 1 palm{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}}
- 3 palms (Med. {{lang|owl|palẏw}}, Mod. {{lang|cy|palf}}) = 1 foot{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}}
- 3 feet (Med. {{lang|owl|troetued}}, Mod. {{lang|cy|troedfedd}}, {{abbr|lit.|literally}} "footlength") = 1 pace{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}
- 4 feet = 1 short yoke (Med. {{lang|owl|uerr yeu}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}} or {{lang|owl|uerrẏeu}},{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §1]}} Mod. {{lang|cy|byr iau}})
- 3 paces ({{lang|owl|cam}}) = 1 leap{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}
- 8 feet = 1 field yoke (Med. {{lang|owl|veieu}}){{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}} or second yoke (Med. {{lang|owl|eẏl yeu}}){{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §1]}}
- 12 feet = 4 paces = 1 lateral yoke (Med. {{lang|owl|gesseẏlẏeu}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §1]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}} or {{lang|owl|cessel-yeu}}{{sfnp|Lewis|1913|p=[https://archive.org/stream/glossaryofmediae00lewi#page/42/mode/2up 42]}})
- 3 leaps (Med. {{lang|owl|neẏt}}, Mod. {{lang|cy|naid}}) = 1 land{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}
- 16 feet = 1 long yoke (Med. {{lang|owl|hẏrẏeu}}, Mod. {{lang|cy|hir iau}}) = rod (Med. {{lang|owl|gwẏalen}}, Mod. {{lang|cy|gwialen}}){{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §1]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}}{{refn|group=n|Although note that Wade-Evans preferred 18 feet to the rod{{sfnp|Wade-Evans|1909|p=339}} and the Latin Peniarth {{abbr|MS.|manuscript}} 28 gives 16½ feet to the long yoke.}}
- 1000 lands (Med. {{lang|owl|tẏr}}, Mod. {{lang|cy|tir}}) = 1 mile (Med. {{lang|owl|mẏlltẏr}}, Mod. {{lang|cy|milltir}}){{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §5]}}
Area{{see also|maenor}}In the Venedotian Code used in Gwynedd, the basic field unit was the Welsh acre or erw, whose legal description—its breadth as far as a man can reach in either direction with an ox-goad as long as the long yoke (16 Welsh feet) and its length "thirty times that measure"{{sfnp|Owen|1841|p=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 81]}}{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §6]}}—is noted by Owen as ambiguous.{{sfnp|Owen|1841|p=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 81]}} He finds it more likely, however, that the "measure" to be multiplied thirty times is the width of the acre (i.e., two long yokes) rather than a single long yoke.{{sfnp|Owen|1841|p=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 81]}} Thus, at least in theory,{{sfnp|Williams|1869|p=500}} - 2 rods × 30 rods = 1 acre ≈ 1,440 square imperial yards,{{sfnp|Owen|1841|p=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 81]}} or
2 rods × 60 rods = 1 acre ≈ 4,320 square imperial yards{{sfnp|Owen|1841|p=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 81]}} - 4 acres ({{abbr|Med.|Medieval Welsh}} {{lang|owl|erỽ}}, {{abbr|Mod.|Modern Welsh}} {{lang|cy|erw}}, {{abbr|lit.|literally}} "tilled [land]";{{sfnp|Wade-Evans|1909|p=344}} {{lang-la|acra}}) = 1 homestead{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §7]}}
- 4 homesteads (Med. {{lang|owl|tẏdẏn}}, Mod. {{lang|cy|tyddyn}}) = 1 shareland{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §8]}}
- 4 sharelands (Med. {{lang|owl|randẏr}}, Mod. {{lang|cy|rhandir}}) = 1 holding{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §9]}}{{refn|group=n|Lewis's account, based on Gwynedd's Black Book of Chirk, gives the gafael as holding 34 erwau rather than 64.{{sfnp|Lewis|1913|p=[https://archive.org/stream/glossaryofmediae00lewi#page/42/mode/2up 42]}}}}
- 4 holdings (Med. {{lang|owl|gauael}}, Mod. {{lang|cy|gafael}}) = 1 township{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §10]}}
- 4 townships (Med. {{lang|owl|trew}}, Mod. {{lang|cy|tref}}) = 1 manor{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §11]}}
- 12½ manors (Med. {{lang|owl|maẏnaul}}, Mod. {{lang|cy|maenor}}) = 1 commote{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §12]}}
- 2 commotes (Med. {{lang|owl|kẏmut}}, Mod. {{lang|cy|cwmwd}}) = 1 cantref{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §12]}} = 25,600 acres{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 Book II, Ch. XVII, §13]}}
although in fact the commutes and cantrefs were fixed political entities with quite various sizes. The 11th-century Bleddyn ap Cynfyn is also described as having changed the legal composition of the homestead for purposes of inheritance &c., varying its size depending on the social status of the owner. The homestead of a nobleman ({{lang|owl|uchelwr}}) was 12 Welsh acres, that of a serf (Med. {{lang|owl|eẏllt}}, {{abbr|Mod.|Modern Welsh}} {{lang|cy|aillt}}) had 8, and that of a bondsman or slave (Med. {{lang|owl|godaẏauc}}) had 4. The text, however, notes the uncommonness of this division and says it was generally understood as 4 acres regardless of status.{{sfnp|Owen|1841|loc=[https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA81 Book II, Ch. XII, §1]}} In the Dimetian Code used in southern Wales, the same divisions were reckoned differently: - 2 rods × 18 rods = 1 acre{{sfnp|Wade-Evans|1909|p=339}}
- 312 acres = 1 shareland{{sfnp|Wade-Evans|1909|p=339}}
- 3 sharelands held by serfs = 1 serf-town{{sfnp|Wade-Evans|1909|p=344}}
- 4 sharelands held in freehold = 1 free town{{sfnp|Wade-Evans|1909|p=344}}
- 7 serf-towns ({{lang|cy|taeogtref}}) = 1 lowland manor (Med. {{lang|owl|maenaỽr vro}}, Mod. {{lang|cy|maenor vro}}) = 936 acres{{sfnp|Wade-Evans|1909|p=344}}
- 12 free towns (Med. {{lang|owl|tref ryd}}, Mod. {{lang|cy|tref rhydd}}) = 1 upland manor (Med. {{lang|owl|maenaỽr vrthtir}}, Mod. {{lang|cy|maenor wrthdir}}) = 1248 acres{{sfnp|Wade-Evans|1909|p=344}}
Volume- 1 Hestawr = 2 Winchester bushels
Time{{main|Celtic calendar}}The Welsh seem to have used an eight-{{refn|group=n|The modern Welsh word for "week" is wythnos: "eight nights"}} or nine-day week,{{sfnp|Jones|2007|loc=note 5}} rather than a seven-day one, long after their conversion to Christianity. See also - Roman units
- English units
- Megalithic yard, a proposed measure employed by the British megalith builders
- Historical weights and measures
NotesReferencesCitations{{reflist|30em}}Bibliography- {{Citation |last=Lewis |first=Timothy |url=https://archive.org/stream/glossaryofmediae00lewi#page/42/mode/2up |title=A glossary of mediaeval Welsh law, based upon the Black book of Chirk |publisher=University Press |location=Manchester |date=1913}}.
- {{Citation |editor-last=Owen |editor-first=Aneurin |author-link=Aneurin Owen |date=1841 |title=Ancient Laws and Institutes of Wales; Comprising Laws Supposed to be Enacted by Howel the Good, Modified by Subsequent Regulations under the Native Princes prior to the Conquest by Edward the First: And Anomalous Laws, Consisting Principally of Institutions which by the Statute of Ruddlan were Admitted to Continue in Force: With an English Translation of the Welsh Text, to which are Added A few Latin Transcripts, Containing Digests of the Welsh Laws, Principally of the Dimetian Code |contribution-url=https://books.google.co.uk/books?id=zYZCAAAAcAAJ&pg=PA90 |contribution=The Venedotian Code |location=London |publisher=Commissioners on the Public Records of the Kingdom }}. {{cy icon}} & {{en icon}}
- {{Citation |last=Roche |first=John J. |title=The Mathematics of Measurement: A Critical History |url=https://books.google.co.uk/books?id=eiQOqS-Q6EkC&pg=PA25 |location=London |publisher=Athlone Press |year=1998 |isbn=0-387-91581-8 }}.
- {{Citation |last=Wade-Evans |first=Arthur |author-link=Arthur Wade-Evans |title=Welsh Medieval Law, Being a Text of the Laws of Howel the Good, Namely the British Museum Harleian MS. 4353 of the 13th Century, with Translation, Introduction, Appendix, Glossary, Index, and a Map |publisher=Clarendon Press |date=1909 |location=Oxford }}.
- {{Citation |last=Wade-Evans |first=Arthur |author-link=Arthur Wade-Evans |ref={{harvid|Jones|2007}} |contribution-url=http://www.maryjones.us/ctexts/laws_hywel_dda.html |contribution=The Laws of Hywel Dda: Harleian MS 4353 (V) with emendations from Cleopatra A XIV (W), ca. 1285 |title=Celtic Literature Collective |editor-last=Jones |editor-first=Mary |date=2007 |accessdate=1 February 2013 }}.
- {{Citation |last=Williams |first=Jane |url=https://books.google.com/books?id=DIXiB0AX-rAC&pg=PA500 |title=A History of Wales: Derived from Authentic Sources |date=1869 |orig-year=Republished at Cambridge by Cambridge University Press in 2010 |isbn=978-1-108-02085-5 }}.
{{systems of measurement}} 3 : Units of measurement|History of Wales|Units of measurement by country |