Hadrian

Hadrian, cousin of Trajan had been left in Asia by Trajan to lead the troops and then adopted by him as his successor. Hadrian wanting to grant a long period of peace for the now too vast empire, renounced all the territories conquered by Trajan beyond the river Euphrates, considering it a border easier to defend. Then he marked out the boundaries in the extreme north, in Britain, where he built the famous Vallum Hadriani (Hadrian's Walls) and also reinforced the borders along the Rhine river.
But it was his conciliatory policy with neighbouring states, that granted a durable peace. He preferred to come to a pacific agreement instead of using violence. Hadrian could thus devote himself to works of peace: he built Hadrian's Tomb or Castel Sant' Angelo and the Pantheon.
His name is linked to the Perpetual Edict, a code written by the jurist Salvo Giuliano.
He was called the tourist emperor, because he travelled throughout the empire, without neglecting his duties as Head of State. He visited many towns and monuments and bought back to Italy many works of art which he used to adorn his villa.