Friday, 10 March 2017
a legendary Norse hero (see here);
a planet visited by Dominic Flandry (see here);
a character in Hrolk Kraki's Saga (see the above link);
an immortal in The Boat Of A Million Years (see here);
mentioned on p. 284 of SM Stirling's The Protector's War (New York, 2006), Chapter Ten.
Thus, this single name links:
a future history by Poul Anderson;
Anderson's retelling of a saga;
a historical science fiction novel by Anderson;
an alternative history novel by Stirling.
Starkad might be one of our travelers through the megamultiverse.