By 1406 , Ostoja was losing what little support he had left in Bosnia , with the nobility now unanimously favouring Tvrtko .
The former king 's decision to remain in the country continued to trouble Tvrtko .
By 1406 , Ostoja was losing what little support he had left in Bosnia , with the nobility now unanimously favouring Tvrtko , but the former king 's decision to remain in the country continued to trouble Tvrtko .