How many magi visited Jesus and when?

We've seen the Nativity scenes with the three magi visiting Jesus in the manger and heard the song We Three Kings of Orient Are. But who were the magi? And when did they actually visit Jesus?

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Images obtained from Wikimedia Commons, Pixabay, or AI generated.

Song via Chillmore on Pixabay.
https://pixabay.com/music/christmas-we-three-kings-christmas-bells-129116/