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 investigated a plot against him that was hatched by the former king. In 1555, the monarch cut off his connections with the Portuguese who were seen as disruptive and a threat to the state, expelling all 70 Portuguese residents from the kingdom.