After the truce with Sigismund of Luxembourg in 1396, Otto was appointed to Wenceslaus' royal council.

Wenceslaus was recaptured in 1402, and for his loyalty, Sigismund appointed Otto as provincial under-chamberlain [cs] in the Kingdom of Bohemia.

Otto raised taxes on cities and monasteries and instituted a Jewish pogrom, which resulted in an influx of money into the royal treasury.

In a contemporary report, it was stated that, " ...the Hungarian king Sigismund committed many evils with the help of some Czech lords like... [Otto] Bergau... and so on.

"[1] In 1403, Otto was appointed one of a five-member group of executors of power when Sigismund left the country.