The historical sources from Dominic's own time period tell us nothing about his involvement in the Inquisition, although several early Dominicans, including some of Dominic's first followers, did become inquisitors.
Although several early Dominicans did become inquisitors. This is including some of Dominic's first followers. This is what the historical sources from Dominic's own time period tell us nothing about his involvement in the Inquisition.