sentences:  After 1669 Lord Dillon inherited an estate of in County Mayo and County Roscommon from his uncle, Sir James Dillon, youngest son of the 1st Viscount.Lord Dillon died in 1673 and was succeeded by Thomas, his only surviving son, as the 5th Viscount.When the 5th Viscount died childless, the title passed to his first cousin Lucas, the 6th Viscount, and thereafter to the Loughglynn branch of the family, which descended from the 1st Viscount through his second son, Lucas Dillon of Loughglynn.