Trajan (originally named as Marcus Ulpius Nerva Traianus) is a roman emperor who is said to have reigned during 98AD. He is known for reshaping the city of Rome leaving many landmarks as Trajan's Market, Trajan's Forum, Trajan's column etc. He was also a famous military commander, triumphing many battles and played a vital role in expanding the Roman Empire.
It was also said that Trajan's reputation was great, that the new emporers after his reign were honoured by the Senate with a prayer "felicior Augusto, melior Traiano" which means "may he be luckier than Augustus, and better than Trajan".
This is his statue just outside Tower Hill Tube station in London, in front of the last remaining pieces of London Wall (a defensive wall built by Romans in 200AD).