1911 Encyclopædia Britannica, Volume 8… (1911)
“ After the death of Edward IV. Dorset and his brother Richard Grey were among the supporters of their half-brother, the young king Edward V.; thus they incurred the enmity of Richard duke of Gloucester, afterwards Richard III., and Richard Grey having been arrested, was beheaded at Pontefract in June 1483, while his elder brother, the marquess, saved his life by flight. Dorset was one of the leaders of the duke of Buckingham’s insurrection, and when this failed he joined Henry earl of Richmond in Brittany, but he was left behind in Paris when the future king crossed over to England in 1485. ”
