Which preposition to use with conveners

of Occurrences 4%

This flag is kept by the Convener of the Trades; at whose appearance therewith, it is said that not only the artificers of Edinburgh are obliged to repair to it, but all the artisans or craftsmen within Scotland are bound to follow it, and fight under the Convener of Edinburgh as aforesaid.

Which preposition to use with  conveners