two black pebbles

Having just been ordained a priest on the continent, Patrick planned to return to Ireland for the first time since his kidnapping, bringing with him enough gold to buy his freedom twice over from Miliucc, the northeastern landowner who enslaved him. Word quickly arrived to Miliucc that his former slave had landed on Ireland’s eastern coast, and that he carried the authority of a new kingdom. According to Muirchú, “[Miliucc] did not want to become a subject to his former servant, nor that the servant should now rule over him,” and so “he gathered all his possessions in the house where he was once a king and set fire to them and himself.” 

What did Patrick do when his plan for peace literally went up in flames?