Diogo's early struggles are documented in a legal inquest he conducted in 1550 into a plot against him launched by the former king. In 1555, the king cut all ties with the Portuguese whom he saw as meddlesome and a threat to the kingdom and expelled all 70 Portuguese inhabitants from the kingdom.
In 1550, Diogo conducted a legal inquiry into a plot against him that was planned by the former monarch. In 1555, the king ended his ties with the Portuguese who were perceived as disruptive and a threat to the state, expelling all 70 Portuguese inhabitants from the kingdom.