New Age of Ivalice
Prince Orinas was the youngest son of King Omdoria. He was the oldest male child that had legitimate claim to the throne. However, at age 5 when The Lion War started, he was not old enough to rule. He was the heir supported by Prince Bestrada Larg and one of the causes of The Lion War.
He was found dead at the end of The Lion War in his bedroom. It is speculated that the young prince was assassinated but there is no proof otherwise. He had been sick for the last few weeks so it is possible that his death could have been health related.