droit de seigneur
Concise Oxford English Dictionary © 2008 Oxford University Press:
droit de seigneur /ˌdrwʌ də sɛnˈjəː/
▶noun the alleged right of a medieval feudal lord to have sexual intercourse with a vassal's bride on her wedding night.
– origin Fr., lit. ‘lord's right’.
'droit de seigneur' also found in these Oxford entries:

