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Leif Erikson is a Medieval Era Great Admiral in Civilization VI. His unit provides +5 
Combat Strength and +1 
Movement Movement to Medieval and Renaissance era naval units within 2 tiles.
Retiring Leif Erikson allows all naval units to move over ocean tiles without the normal technology requirement. In Gathering Storm, in addition, his retirement grants 1 Sight range for all naval units.
Civilopedia entry
While the Europeans were just paddling around in the placid Mediterranean or scuttling between the British Isles and the mainland, the Norse were traversing the daunting North Atlantic. Leif was born the second son of Eric the Red, probably in Iceland, c. 970 AD. When Eric got himself banished from Iceland, he sailed west and settled his family and thralls in Greenland in 986.
According to accounts (those histrionic Viking sagas), Erikson as a young man sailed to Norway in 1000, where he was convinced somehow to convert to Christianity. The Norwegian king Olaf commissioned Leif to return to Greenland to proselytize, showing his heathen relations the errors of their ways. While Erikson made it to Greenland, on his voyage back to Scandinavia the following year his fleet got lost and ended up off North America. Disembarking on the shore of what is likely Nova Scotia, Leif named the new land “Vinland” (because of the wild grapes found there).
Whatever his motives (or lack thereof) or seafaring skill (or lack thereof), Leif Erikson is considered to be the first European to stumble onto the “New” World – whatever the pretentions of that sycophant Columbus 500 years later. Archaeological digs in the 1960s confirmed there was a Norse settlement on the northern tip of Newfoundland, perhaps Leifsbudir referred to in the Groenlendinga saga. Leif himself didn’t remain in this unholy place, and returned to Greenland in the spring – never to come back (although his brother did … dying in a skirmish with irate natives).
Back in Greenland, Leif’s father proved “unreceptive” to the muddled Christian faith, but Leif did manage to convert his mother. When Eric the Red passed, Leif took over as chieftain of the Greenland holdings. Nothing is recorded of his short reign, and he died c. 1020.
