[humanistbot]

If King Arthur actually existed in the 5th-7th century (the tales are from the 9th-12th century) you wouldn't be able to understand him at all. You probably wouldn't even be able to understand the Old English of the 12th century tales either.

Hola has a much longer history, to 5th-7th century, per https://en.wiktionary.org/wiki/hola

Spanish: This is related to greetings in Germanic cognates such as Dutch hola, Old High German holā, emphatic imperative of Old High German holōn (“to fetch, used especially in hailing a ferryman”)

Dutch: From Late Middle Dutch hola (“wait up!, hold on!, calm down!”), which also had the dialectal form holla; compare Middle Low German hola!, holda! (interjection), Middle High German holā! (interjection), of obscure origin. Possibly from the imperative of Middle Dutch halen, *holen (“to fetch”) (> dialectal holen), or possibly from Old French holà (“hey!”), from ho (“hold!, halt!, stop!”) + là (“there”).