Chapter 49(p. 49): Following Baldr's death, the Æsir prepare his funeral pyre upon his great ship. The text explicitly names it and declares it the largest of all ships.
So the Æsir took Baldr’s body and carried it to the sea. Hringhorni was the name of Baldr’s ship. It was the biggest of all ships. This the Æsir planned to launch and perform on it Baldr’s funeral.
Chapter 4-5(p. 74): When listing the proper kennings (poetic names) for Baldr, the text identifies him as the owner of the ship.
How shall Baldr be referred to? By calling him son of Odin and Frigg, husband of Nanna, father of Forseti, owner of Hringhorni and Draupnir...
Chapter 75(p. 162): In a long, categorical list of names for ships, Hringhorni (spelled here as Hringhornir) is included.
Freighter, buss, bow-cold and reindeer, bac, thole-strap fixed, rimy-bowed, cruiser, boat and pinnace, brig, Hringhornir, long-boat, keel, longship, Leifnir, carvel.
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