Why do you think the vassals had to swear an oath to remain faithful to the king?

The Vassals had to swear oath to his lord. Fealty means the duties of a vessel for his king. It included the swearing for remaining faithful to the lord, the act of homage preceded it. In act of homage the vassal used to kneel before the lords and placing his hand in the hands of the lord promised to stay loyal . The oath took place upon a religious object such as Bible. fealty and homage were the key elements of European feudalism. Fidelity is different from the other parts of homage as is refers to that part of ceremony where the vassal swore to be a good vassal to his lord.

The Vassals oath was a  promise not to harm his lord or damage his property, it was a recognition of the assistance owed by the tenant to his lord and the protection owed by the lord to the tenant.

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.

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