The Circus Maximus was originally built in the sixth century BCE. Permanent starting gates were constructed in 329 BCE, and they were rebuilt in 174 BCE. Julius Caesar lengthened the track and built a euripus (water filled channel) around it in 46 BCE. In 33 BCE, Agrippa supplemented the large wooden eggs used for marking laps with seven bronze dolphins instead. In 31 BCE, a fire destroyed most of the Circus, and Augustus rebuilt it, and added an imperial box, or a pulvinar. In 10 BCE, an obelisk was erected as a dedication to the sun, and as a monument for the conquest of Egypt. Finally, in 80 CE, Trajan restored the temple to greater than ever before after a fire, changing some seats into marble, making massive columns and arches on the sides, adding walkways between seats, and allowing men and women to sit together.