The main protagonist of the events of Amaiur in 1522, was born in the tower house of the family of Igúzquiza towards 1475. Due to the connections of his lineage with the Navarros kings and the Agaramontese families, in 1512 Pedro de Navarra will organize the resistance together with the marshal.

Below we will see in the front line all the elevations against the conquerors: 1513, 1516 and 1521. He surrendered to Amaiur, probably in the hope of being freed by rescue and organizing a new uprising. But he was killed in the cell in Pamplona, we don't know how.

Since then, the heirs made no mention of Jaime Belaz Medrano and Etxaniz, and their name and history has gone unnoticed for many.