[200] St. Ephrun, Deacon of Edessa, in his _Sermo I. de Pœnitentia XV._, uses glass mosaic as an illustration of the sacrament of penance. "Penance is a great furnace: it receives glass and changes it into gold. It takes lead and makes it silver.... Have you seen glass, how it is made of the colour of beryl, emerald, and sapphire? You cannot doubt, too, that penance makes silver of lead and gold of glass. If human art knows how to mix nature with nature, and change what was before, how much more would the grace of God be able to effect? Man has added gold-leaf to glass, and in appearance that seems gold which was before glass. If man had chosen to mix in gold, the glass would have been made golden; but avoiding the cost, he invented the fitting together and inserting the thinnest leaf." [201] The Dal Colle family were nobles of Pisa. A deed in the archives of the Duomo dated 1229 registers the sale of some land to Giunta by the Archbishop Vitale--"Vendo tibi Juncti q Guidotti de Colle totum unum edificium," etc. [202] "Circa an. sal. 1210, Juncta Pisanus ruditer a Græcis Instructus amoenitas primus ex Italia artem apprehendit."--Padre Angeli, _Collis Paradisi seu sacri conv. assissiens. historiæ_, Liber I. Tit. xxiv. [203] (See Vasari, _Life of Andrea Tafi_.) Tafi was a nickname. In his matriculation to the Arte de' Medici e Speziali, where the painters had to enroll themselves after their split from the Masonic Guild, he is written as "Andreas vocatus Tafi olim Ricchi." [204] Archives of Opere Del Duomo, Pisa. Docum. 26, libro sud anno 1301 sud "_Magister Cimabue pictor Magiestatis pro se et famulo suo pro diebus quatuor quibus laborarunt in dicta Opera ad rationem solid. X. pro die libr II._ "_II. Cimabue pictor Magiestatis sua sponte confessus fuit se habuisse a D. Operario de summa libr: decem quas dictus Cimabue habere debebat de figura S. Johannis quas fecit juxta Magiestatem libr V sol X._ "_III. Bacciomeus filius Jovenchi mediolanensis ... fuit confessus se habuisse ... de precio vitri laborati et colorati quem facere debuit juxta ... et voluntatem magistri Cimabovis pictoris, quem vitris Bacciomeus vendere et dare debet suprad. operario ad rationem den. XXIIII pro qualibet libra pro operando ipsum ad illas figuras que noviter fiunt circe Magiestatem inceptam in majori Ecclesia S. Maria._"--See Morrona, _Pisa Illustrata_, etc., vol. i. p. 249, notes. [205] Quoted by Del Migliore in _Firenze Illustrata_, p. 414. [206] Gozzoli is in some books entered as Benozzo di Lese de Fiorenza, in others as "di Cese de Florentia." So uncertain is mediæval spelling. [207] Extract from the book entitled in Latin: "Introitus et exilus facti et habiti a Burgundio Tadi Operario opere sc͠e marie dis. majoris ecclē. sub A.D. MCCCII. Ind IIII de mense madij incept... Magistri Magiestatis majoris