1462 Extracts Rec. in W. Chambers (1872) 147 That na commoun..be..gewyn in perpetuale bot with the dousan.
1490 (Edinb. Reg. House) 4 Dec. I..sal varrande and in perpetule sal defende the forsaide lande to the saide Iohnne.
1596 J. Dalrymple tr. J. Leslie (1888) I. 302 That in perpetuall ane of that surname sal be Mareschall.