Ruchlaw, an ancient mansion in Whittingham parish, Haddingtonshire, on the left bank of Souchet Water, 3¾ miles SE of East Linton. Its owner, Thomas Buchan Sydserff, Esq. (b. 1822; suc. 1839), holds 2200 acres in the shire, valued at £1701 per annum.—Ord. Sur., sh. 33, 1863.

(F.H. Groome, Ordnance Gazetteer of Scotland (1882-4); © 2004 Gazetteer for Scotland)