Through maternal side, he was related to Sixtus, a canon of Esztergom and illustrious diplomat in the royal court of King Béla IV.
Historian Krisztina Tóth argued Paul connected to the Szécs clan only from maternal side, as Mikó did not mention him in his last will and testament in 1305.
[1] He appeared first in contemporary sources in 1258, when Sixtus sold some part of his inherited land in Hetény (today Chotín in Slovakia) to his relative and neighbour Mikó, in order to finance his diplomatic mission to Rome.
[1] Both Maurice and Mikó belonged to the inner circle of Queen Elizabeth of Sicily (or Isabella), who was protegeed by Lodomer after her release from imprisonment in the Margaret Island.
[4] A charter from that year narrated that Mikó accidentally broke the queen's seal, when Benedict Rád, Bishop of Veszprém requested confirmation the ownership of lands in Zala County.
As brothers Ivan and Henry II Kőszegi besieged and captured Esztergom Castle in that year, Krisztina Tóth considered Mikó was fatally wounded in the skirmish.
Mikó died childless by 6 October 1306, when his relative Paul Szécs neglected his last will and requested to donate the above mentioned lands for himself from King Otto for his loyalty.