Young prince in Tower was Lord of Carlow
What makes this story even more interesting is that younger of the Princes in the Tower was actually the Viceroy of Ireland and The Lord of Carlow at the time of his mysterious disappearance and death whilst in the custody of his Uncle Richard Duke of Gloucester who would become Richard III.
I’ve uncovered an 1865 Dublin publication “History of the Viceroys of Ireland” by renowned Victorian librarian of the Royal Irish Academy and author Sir John Gilbert.