Margaret Sinclair of Roslin

Margaret (either a daughter of Henry Sinclair or his Son William) married Sir John Saint Clair of Herdmanston and had issue, who over three centuries later intermarried with the daughter of the 9th Lord Sinclair. [Burke's Peerage, p. 469]

Margaret (married 2nd Sir John de St Clair of Herdmanston), daughter of Sir William de St Clair or Sinclair of Rosslyn. [Burke's Peerage, p. 1985]

He [Thomas Stewart] m. by Papal dispensation dated 3 June 1353 (being within the fourth degree of consanguinity), Margaret, generally considered to have been daughter of Sir William St. Clair of Roslin, by Isabel, daughter and coheir of Malise, Earl of Strathern, Caithness, and Orkney, which Margaret was, however, more probably sister of the said Sir William. Being imprisoned in Dunbarton Castle, he dsp. legit there, of the plague, 1361. His widow m. Sir John Sinclair, of Hermandstoun. [Complete Peerage I:153, XIV:26]