Cristoforo Buondelmonti - City of Constantinople in the 15th-century Liber insularum Archipelagi
Grettir's half-brother goes looking for revenge, and his killer goes to join the Varangian Guard.
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Sources:
Grettir's Saga, translated by Jesse Byock. Oxford University Press, 2009.
Grettir's Saga, translated by Denton Fox and Hermann Palsson. University of Toronto Press, 1974.
Collingwood, W.G. A Pilgrimage to the Saga-Steads of Iceland. W. Holmes, 1899.