Johannes XXI (d.1277); Pont. Max. 1276-7; formerly Petrus Hispanus; Kelly, Popes, 200-1. ♦ Categorisation: Gender: Unknown. Century: unknown century.

— author (10 entries)

• G‑076 Gerardus de Harderwyck — Commentarii in omnes tractatus parvorum logicalium Petri Hispani iunctis nonnullis modernorum processum Burse Laurentiane in universitate Coloniensi continentes. — Cologne: Ulrich Zell, 5 June 1493. Folio.
• J‑097 Johannes XXI, Pont. Max. (Petrus Hispanus) — Summulae logicales; with ‘Commentum nouum', et al. — Basel: Nicolaus Kesler, 20 June 1487. 4°.
• J‑098 Johannes XXI, Pont. Max. — Summulae logicales. — Lyons: Johannes Trechsel, [c.1490]. 4°.
• J‑099 Johannes XXI, Pont. Max. — Summulae logicales. — Deventer: Richard Pafraet, 25 Jan. 1491. 4°.
• J‑100 Johannes XXI, Pont. Max. — Summulae logicales (comm. Georgius Bruxellensis, ed. Thomas Bricot). — Paris: Andre Bocard for De Marnef, 29 Aug. 1491. 4°.
• J‑101 Johannes XXI, Pont. Max. — Copulata tractatuum Petri Hispani (ed. Lambertus de Monte). — [Cologne: Heinrich Quentell], 4 Dec. 1489. 4°.
• J‑102 Johannes XXI, Pont. Max. — Copulata tractatuum Petri Hispani (ed. Lambertus de Monte). — Cologne: [Heinrich Quentell], 6-7 Apr. 1490. 4°.
• J‑103 Johannes XXI, Pont. Max. — Copulata Parvorum logicalium Petri Hispani. — Cologne: Heinrich Quentell, 1498. 4°.
• J‑104 Johannes XXI, Pont. Max. — Thesaurus pauperum [Italian] Tesoro de poveri. — [Florence: Antonio di Bartolommeo Miscomini, c.1492]. 4°.
• J‑105 Johannes XXI, Pont. Max. — Thesaurus pauperum [Italian] Tesoro de poveri. — Venice: Giovanni Ragazzo and Giovanni Maria di Occimiano, 27 Mar. 1494. 4°.

— subject (2 entries)

• J‑102 Johannes XXI, Pont. Max. — Copulata tractatuum Petri Hispani (ed. Lambertus de Monte). — Cologne: [Heinrich Quentell], 6-7 Apr. 1490. 4°.
• J‑103 Johannes XXI, Pont. Max. — Copulata Parvorum logicalium Petri Hispani. — Cologne: Heinrich Quentell, 1498. 4°.

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