That grin faded as he stared at her in confusion. He knew that she'd talked to Remus so she probably knew that Sirius had been sent to Azkaban for murder. But what did that have to do with--

"Wizard Hitler?" he repeated. He couldn't think of a famous wizard named--

And then he remembered some conversations with Lily and Remus about the parallels in Muggle history. Once again Sirius got to keenly feel the gaps in his education. The best parallel was Grindelwald-- same time. But he doubted that was what she wanted to know about.

"Do you mean Voldemort?"