Senarath Adahasin was king of the Kingdom of Kandy from 1604 to 1635. He is said to be the successor to king Wimaladharmasuriya I of Kandy. However first-hand accounts are not available concerning what happened after the death of Vimaladharmasuriya I. According to most sources, he is said to be a cousin or brother of Vimaladharmasuriya. He was not a legitimate ruler hence he married not only the deceased king's widow Dona Katherina but also her two daughters, to legitimize his claim to the throne.
He did not possess the qualities of a king and during his time Portuguese forces laid waste to Kandyan territory in frequent invasions, which he could not effectively repulse. Several rebellions rose against him during his reign and to quell those he aligned with the Portuguese. Many of his military campaigns failed except for the Battle of Randenivela, the success of which was however largely due to Prince Dewarajasinghe, his youngest son.
