Thomas succeeded as fifth
Lord of Pitcairn and Innernethy, ante 1415. There is a
notarial instrument, which mentions him: "Alexander de Seton,
at St Andrews, is this day nominated overseer or agent of the
powerful nobleman, Lord and Ruler, Thomas de Petcarne, domine, who
promises to employ him as military secretary. This deed is drawn
up at the Castle."
The above charter of Alexander III., is in the Church of the Great
St. Thomas the martyr of Aberbrothock, 5th Oct 1415.