Henry's permanent adult exile separated him entirely from England's ruling elite, both literally and in terms of his outlook and experiences. On the one hand, this gave Henry an opportunity to unlock the closed network of personal service that had surrounded medieval royal heirs as Princes of Wales or royal nobles. On the other, it created a great dependence upon the advice and skills of others. Some, like Sir Giles Daubeney and Sir Edward Poynings, had joined Henry after 1483 in opposition to Richard III. Others, like John de Vere, earl of Oxford, followed Henry because he was the only chance they had of recovering their lands and influence. Henry could not fully trust them to remain loyal if political circumstances changed again.