He has stolen all the lead from the Ankh-Morpork Opera House, prior to the events of Maskerade. Afterwards, he hid out in a brothel (which Nanny thought was an ordinary hotel). When Nanny Ogg and Granny Weatherwax arrive there in Maskerade, trying to locate the publisher of her book ``The Joye of Snacks'' (and of course, check in on Agnes), Nanny is shocked, but Granny is on friendly terms with the Madame.
Nanny
Granny