llath [Welsh]

Please see: llathen, erw.

Plural, llathau. In Wales, a unit of land area, varying by locality.

I shall always use the word llath in the indefinite sense of a rod, which is its right meaning, applying it to measuring poles of various lengths. Llath must, of course, be distinguished from llathen.

Alfred Neobard Palmer.
Notes on ancient Welsh measures of land.
Archaeologia Cambrensis. 5th series. vol. 13, no. 49. (January 1896)
Page 2.

Some examples:

side of square in feet	area of llath in sq. ft	number in an erw
24	576	160
21	441	160
11½	132¼	768

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