No Room

An Englishman, an Irishman and a Scotsman arrived up at a big hotel only to be told by The manager that there were no rooms available.
I'm descended from The Kings of England,' said The Englishman. 'You must have a room for me.'
'Sorry,' said The manager. 'No rooms available.'
'I'm descended from The Kings of Scotland,' said The Scotsman. 'You must have a room for me.'
'Sorry,' said The manager. 'No rooms available.'
'Look,' said The Irishman, 'if The Pope arrived up now, would you have a room for him?'
'Well,' said The manager, 'If The Pope arrived, I think we might find a room for him.'
'Great,' said The Irishman. The Pope can't make it - I'll have his room.'