The appointment of the town’s Mayor (as well as its MP) was at the discretion of the Lord of the Castle who ensured that his Constable held this office.
Arglwydd y Castell oedd yn penodi Maer y dref (yn ogystal â’r Aelod Seneddol), a byddai’n sicrhau mai ei Gwnstabl a fyddai'n cael y swydd hon.