Relations later improved , allowing Becket 's return .
Relations later soured again when Becket saw the coronation of Henry 's son as coregent by the Archbishop of York as a challenge to his authority and excommunicated those who had offended him .
Relations later improved , allowing Becket 's return , but soured again when Becket saw the coronation of Henry 's son as coregent by the Archbishop of York as a challenge to his authority and excommunicated those who had offended him .