7. Jan van den Plas was the high sheriff of ’s Hertogenbosch in the years 1311-1312 and in 1317 (‘s Hertogenbosch city archives: http://www.stadsarchief.nl/content.cfm?contentid=D1501CEE-8021-0F65-08822430BCDF0C05 (last accessed on 1 May 2010) ).