[The Squatter of Amon Rûdh]

The second part of the clue is rose - e. So we have the scion of a noble house whose name ends in ros. There are three possible answers and I can't work out how to achieve any of them from 'sacred flower'. I think it's Maedhros, but the only reference I can find to maedh being sacred is in the name of St Maedhog, Bishop of Ferns.