The Norse god Wotan - like his counterparts in the south, Zeus and Jupiter - got around as they say. He wasn't named "all-father" for nothing. The second opera of Richard Wagner's Ring cycle is about three of his offspring.
First, the legitimate daughter Brünnhilde, who is a Valkyrie -a collector of the heroic dead slain in battle - and after whom this opera is named. Then there are the twins Siegmund and Sieglende, their mother is Erda - mother earth.