This detail from the Marble Map (Plate XVII) clearly shows the Arch of Titus and the spina of the Circus. To the left, are fragments depicting the Septizodium of Septimius Severus.
Reference: La Pianta Marmorea di Roma Antica: Forma Urbis Romae (1960) by Gianfilippo Carettoni, Antonio M. Colini, Lucos Cozza, and Guglielmo Gatti.
