Both Castle Coole and Richard Cassel's Leinster House in Dublin claim to have inspired the architect James Hoban, who designed the executive mansion, built between 1792 and 1800.
Både Castle Coole og Richard Cassels Leinster House i Dublin hævdes at have inspireret arkitekten James Hoban, der udarbejdede det fornemme palæ, bygget mellem 1792 og 1800 .