Who was abbot of aberbrothok?

The Abbot of Aberbrothok, also known as Arbroath, was the head of the Abbey of Arbroath in Scotland, which was founded in 1178. One of the most notable abbots was Bernard of Arbroath, who served in the late 12th century and played a significant role in the establishment of the Abbey's influence. The abbey is also famous for the Declaration of Arbroath, a document asserting Scottish independence, which was written in 1320 during the abbacy of William de Lamberton.