Among the monuments erected by Augustus at Rome were two obelisks, about which the elder Pliny gives fairly full information. They had originally been erected in Egypt by two different monarchs, and, when Augustus had them transported to Rome, the one was placed in the Circus Maximus, the other in the Campus Martius. Moreover, the latter was put to practical use by being an essential part of the large solarium erected by the Emperor. Somewhat earlier in the same book Pliny attributes the setting up of the first obelisk to Mespheres at Heliopolis. The king had been warned to do this in a dream. In his chapter on obelisks Isidore also attributes the institution of this form of monument to this king, whom he calls Mesfres. He further gives more precise reasons for the dedication, and then passes on to the obelisk in the middle of the Circus; though his description is somewhat obscure, it is implied that the obelisk was used for a sun-dial. This passage from Isidore is reproduced in the Liber Glossarum, together with a sentence which is not in the MSS. of Isidore, and which occurs between sections 1 and 2 of the chapter in question:– ‘unum quippe fecit pedibus septuaginta quinque, alterum septuaginta sex quos Augustus ab ultima Aegypto deportatos alterum ex his Circo, alterum in Campo Martio posuit.’