The altar bore the inscription "Ara Primogeniti Dei." Those who seek a more humble origin for the church, say that the name merely dates from mediæval times, when it was called "Sta, Maria in Aurocœlio." It originally belonged to the Benedictine Order, but was transferred to the Franciscans by Innocent IV. in 1252, since which time its convent has occupied an important position as the residence of the General of the Minor Franciscans (Grey-friars), and is the centre of religious life in that Order. The staircase on the left of the Senators' palace, which leads to the side entrance of Ara-Cœli, is in itself full of historical associations. It was at its head that Valerius the consul was killed in the conflict with Herdonius for the possession of the Capitol. It was down the ancient steps on this site that Annius, the envoy of the Latins, fell (B.C. 340), and was nearly killed, after his audacious proposition in the temple of Jupiter, that the Latins and Romans should become one nation, and have a common senate and consuls. Here also,[45] in B.C. 133, Tiberius Gracchus was knocked down with the leg of a chair, and killed in front of the temple of Jupiter. It is at the top of these steps, that the monks of Ara-Cœli, who are celebrated as dentists, perform their hideous, but useful and gratuitous operations, which may be witnessed here every morning! Over the side entrance of Ara-Cœli is a beautiful mosaic of the Virgin and Child. This, with the ancient brick arches above, framing fragments of deep blue sky--and the worn steps below--forms a subject dear to Roman artists, and is often introduced as a background to groups of monks and peasants. The interior of the church is vast, solemn, and highly picturesque. It was here, as Gibbon himself tells us, that on the 15th of October, 1764, as he sat musing amidst the ruins of the Capitol, while the bare-footed friars were singing vespers, the idea of writing the "Decline and Fall" of the city first started to his mind.