Peter Abelard
Astrolabe, son of Abelard and Héloïse

Shortly after the birth of their child, Astrolabe, Héloïse and Abelard were both cloistered. Their son was thus brought up by Abelard's sister, Dionysia, at Abelard's childhood home in Le Pallet. His name derives from the astrolabe, a Persian astronomical instrument said to elegantly model the universe and which was popularized in France by Adelard of Bath. He is mentioned in Abelard's poem to his son, the Carmen Astralabium, and by Abelard's protector, Peter the Venerable of Cluny, who wrote to Héloise: "I will gladly do my best to obtain a prebend in one of the great churches for your Astrolabe, who is also ours for your sake".

'Petrus Astralabius' is recorded at the Cathedral of Nantes in 1150, and the same name appears again later at the Cistercian abbey at Hauterive in what is now Switzerland. Given the extreme eccentricity of the name, it is almost certain that these references are to the same person. Astrolabe is recorded in the Paraclete necrology as dying on 29 or 30 October, year unknown, appearing as "Petrus Astralabius magistri nostri Petri filius" (son of our master Peter).
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