Capitoline Hill: One of the seven hills of ancient Rome, northwest of the Palatine, on the left bank of the Tiber, on which the Capitol was erected. After the construction of the Servian wall it constituted the citadel of the city. On its southwestern summit was the famed Tarpeian Rock; on its northeastern summit rose the temple of Jupiter Capitolinus. The modern capitol stands between the two summits. From the Capitoline the Forum Romanum extends its long, narrow area toward the southeast, skirting the northern foot of th