Conversation so far:
Who's mistress was Lillie Langtry?
Prince.
How did they meet?
seated at the other end of the table.
How long did their affair last?
had six children.
Why did their affair end?
Lillie Langtry's physical relationship with him ended when she became pregnant.
Did she have affairs with anyone else?
she became pregnant, probably by her old friend Arthur Jones.

Question: What was the child's name?
Self-contained rewrite: What was Lillie Langtry's child's name?