[2] Detailed knowledge of Thomas' father is lacking, but one "Nicholas son of Robert" is found as a burgess of Dundee in a Lindores Abbey document dated between 1237 and 1243.
There is no proof that the two families were kindred, although in the early 1310s Thomas was recorded as assisting Hervey's brother Radulf de Dundee obtain a loan for his daughter's marriage portion.
[2] Perhaps soon after or soon before, Thomas inspected charters of Paisley Abbey on behalf of Laurence de Ergadia, Bishop of Argyll.
[6] It is possible that Thomas was still at the papal court when the cathedral chapter of the diocese of Ross were carrying out their elections for the successor of Robert de Fyvie.
[8] In the following year Adam de Darlington was compensated by being appointed Bishop of Caithness, the bishopric which adjoined Ross to the north.
[2] On this date his seal was attached to a document which recorded the losses suffered by Scone Abbey following the Scottish rebel defeat by the English crown at the Battle of Falkirk.
[11] In the first few years of the 14th century Thomas witnessed three charters of Coupar Angus Abbey in the company of Robert Wishart, Bishop of Glasgow, a known opponent of the English crown.
[12] It appears that Bishop Thomas remained pro-English and pro-Balliol after the rising in 1306 of Robert de Brus, Earl of Carrick.
On 13 December 1307 King Robert secured the submission of Bishop Thomas' temporal protector, Earl William.
[12] Thomas was the recipient of a papal mandate issued on 1 June 1317 authorising him to give dispensation for the wrongful marriage between King Robert's brother Edward de Brus and a daughter of Earl William of Ross.
The parish of Avoch lay within Thomas' diocese, but the Abbot of Kinloss claimed the primary right to possess it.
A papal mandate was issued on 5 January 1325 to William de Lindores, the Chancellor of Ross, commanding him to judge the dispute.