the.com/knight errant

means A wandering medieval knight who roamed from place to place in search of adventures, quests, and chances to prove his chivalric virtue.

from From Old French 'errant,' present participle of 'errer' meaning 'to travel' or 'to wander' — rooted in Latin 'iterare' (to journey), related to 'iter,' a road or way. It's a distant cousin, via that same wandering sense, to the word 'errant' in 'erratic.' Note the trap: this 'errant' has nothing to do with 'error' (from Latin 'errare,' to stray or mistake) — though the two Latin verbs sound alike and both involve a kind of straying, which is likely why the senses feel so cozy together in English despite starting from separate roots.