Which preposition to use with burkhard

of Occurrences 1%

Burkhard of Swabia, who had asserted his independence, and who was at that time carrying on a bitter feud with Rudolph, King of Burgundy, whom he had defeated, in 919, in a bloody engagement near Winterthur, was the first against whom he directed the united forces of the empire, in whose name he, at the same time, offered him peace and pardon.

Which preposition to use with  burkhard