 The Romanov dynasty, which succeeded Ivan the Terrible's Rurik dynasty and ruled Russia from 1613 to 1917, were not descended from Sophia, originating as in-laws, rather than descendants, of the Rurikids.Thomas's older brother Theodore II, who preceded him (and co-ruled with him for a time) as Despot of the Morea, had a daughter, Helena, who married King John II of Cyprus.Their only child to survive until adulthood, Charlotte, died childless in 1487.