Under Gregory IX., A.D. 1227, the Annibaldi family obtained a decree from Frederic II., requiring the Frangipani to cede to them one-half of the Colosseum fortress, which might have led to its entire destruction; but Innocent IV., in 1244, rescinded the engagement, and declared this building to be under the direct dominion of the Holy See. During the residence of the Popes at Avignon, the Colosseum belonged to the Annibaldi or Annibaldeschi, who were then in the ascendant[144]. In 1312, the Emperor Henry VII. obliged them to give it up, and placed it under the care of the municipality, who appropriated it to bull-fights; but this only lasted until 1332, when eighteen youths of noble families were killed by the infuriated bulls, of which a minute account is given in the chronicle of Monaldeschi, printed in Muratori’s collection[145]. In 1349, it was again damaged by the earthquake described in Petrarch’s letters; after this the great families entered into a compact, in 1362, to make the ruins common property as a quarry, by which all might profit[146]. In 1381, the senate gave a portion of the arcades to the Chapter of the Lateran, for a ward to their hospital. Their badge, the head of Christ between two candlesticks, is carved over some of the archways. In 1438, Eugenius IV. built two walls to connect the Colosseum with the monastery of S. Pietro in Vincoli, in order to prevent the evil doings that were going on there; but after the death of that Pope, the Roman people went in a crowd and pulled down those walls which had shut them out of the great building. The monks stated to Flaminius Vacca that they had preserved the deed of gift, and if they ever had a pope from their monastery, it would be acted upon[147]. In the fifteenth century, the great palace of S. Mark of Venice, built by Paul II., 1464-1471, at the south end of the Corso, the Farnese in 1534, the Cancelleria in 1495, the Borghese in 1590, and many other edifices[148], were built out of this quarry. In the sixteenth century it was used for miracle plays; this practice began under Paul III. in 1540[149], a purpose to which it had previously been applied on Good Friday in each year by the “Confraternity of the Gonfalone;” this is mentioned as early as 1263. We have one vestige of this remaining, a view of Jerusalem with the Crucifixion, painted on the wall over the principal entrance then in use at the north end over the arch, and seen in going out as we look up. It shews to what a height the earth had then been raised to make this a convenient place for such a picture. Sixtus V. proposed to turn it into a cloth manufactory, and drawings for that purpose were actually prepared by his architect, Fontana[150], in 1590; but the design was abandoned at the death of the Pope.