He has been identified as the man who wrote a continuation of the Brabantsche Yeesten in the years 1430-1432.
[1] He added two books to the first five by Jan van Boendale, with a total of 12,000 verses.
The ducal court accounts first mention him in 1402 as a chorister (a jonghen clercken, singers op die capelle).
[5] He was ordained a priest and from 1429 was given the responsibility of the chapel of Dry Borren in the Sonian Forest, where he said mass four times a week.
[6] The fact that Van Cotthem was chosen by De Thimo for the commission of the Brabantsche Yeesten might have to do with his acquaintance with the court.