Guillermo I de Escocia
Sir Thomas Gray in his Scalacronica states that William the Lion in 1174, on his return from captivity in Falaise and in England, brought back young Englishmen of family to seek their fortune in the Scottish Court; and among these were named the "Biseys". The first of the name recorded in Scotland is Henricus Byset, who witnessed a charter by William the Lion granted before 1198. His son, John Byset, who witnessed a charter by Henry de Graham in 1204, was the individual who obtained from the king the grant of lands in the north.