Sloane 282, quarto, 15th century, fols. 87-105, Petri Hispani, postea Johannis Papae XXI, Thesaurus pauperum.
Sloane 284, 15th century, fols. 129-174. “Incipit liber qui thesaurus pauperum nominatur compositus a magistro P. Hispano Papa Johanne postmodum.”
Sloane 477, dated Sept. 30, 1309. Fol. 79r, “Explicit thesaurus pauperum ad honorem dei et hominum ipsius operis exigentium. Anno domine mill’o tricentessimo nono die tricessimo mense septembris hoc opus complevi scripsi presbitur N. De. Machia Anconitana hunc scripsit librum cui Christus filius dei et virginis matris marie det sibi gratiam consolationem anime et corpori. Amen.” Then in different ink is added, “Explicit thesaurus pauperum vel summa experimentorum medicinalium magistri petri Hispani.” This MS, which seems as early as any that I examined, is written on small pages in large print-like letters. The red ink of the text has faded and is accompanied by numerous notes in small black writing.
Sloane 521, 14th-15th century, fols. 46-74. “Explicit summa Petri Hispanensis experimentorum medicinalium, cujus libri posuit nomen thesaurus pauperum. Amen. Amen.”
Sloane 1754, 14th century, fols. 8-13. “Flos florum experimentorum thesauri pauperum a magistro Petro Yspano” etc. A collection of excerpts from the work; see also Sloane 357 and 405, both 15th century.
Sloane 2479, 14th century, fols. 10-41. At fol. 38v, “Explicit thesaurus pauperum”; at fol. 41v, “Expliciunt febres et thesaurus pauperum magni petri hispani quondam pape.”
Additional MS 22,636, fols. 23-35r (and not, as the catalogue and Scott’s Index say, to fol. 47, since a work on Phisionomia and some extracts from Thomas of Cantimpré on seals and gems intervene.) “Explicit liber qui dicitur tesaurus pauperum.”
Additional 25,000. This MS resembles Sloane 2479 closely in its arrangement: at fol. 94r, “Explicit liber pauperum”; at fol. 96v, another Explicit follows the discussion of fevers.
Addit. 32,622, early 14th century, fols. 116-177. “Summa experimentorum medicinalium Magistri Petri Ispaliensis, qui dicitur liber nomine thesaurus pauperum.”
Royal 12-B-III, 14th century, #2.