The 8-day Apollo 8 mission carried 3 astronauts for a trip around the moon without landing. It orbited the moon 10 times at ~185 km altitude, while the Artemis II Orion spacecraft will just swing around once around the moon with a lowest altitude of 10,427 km.
Apollo 8 was followed by 2 more crewed missions, one to lunar orbit, before the historic landing in July 1969.
https://en.wikipedia.org/wiki/Apollo_8
https://ntrs.nasa.gov/api/citations/19760005868/downloads/19760005868.pdf
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