Past tense of 'company' used as a verb; to accompany or keep company with someone.
From company + -ed (past tense marker). Though 'company' is typically a noun, in older English it was verbed to mean 'to be a companion to' or 'to accompany.'
Using nouns as verbs is a modern habit we celebrate (let's 'google' that, we 'texted' them), but English has been verbing nouns for centuries—companied shows Shakespeare and his contemporaries were already doing this linguistic creativity.
Complete word intelligence in one call. Free tier — 50 lookups/day.