Question: What was the nationality of the leader of The Heavenly Bodies?
Sentence (from "Triquetrum (astronomy)"): The triquetrum (derived from the Latin "tri-" ["three"] and "quetrum" ["cornered"]) was the medieval name for an ancient astronomical instrument first described by Ptolemy ("c." 90–"c." 168) in the "Almagest" (V. 12).
Relevant evidence: No