The earliest surviving written work on the subject of <answer>architect</answer>ure is De <answer>architect</answer>ura, by the Roman <answer>architect</answer> Vitruvius in the early 1st century AD. According to Vitruvius, a good building should satisfy the three principles of firmitas, utilitas, venustas, commonly known by the original translation – firmness, commodity and delight. An equivalent in modern English would be:
What was Vitruvius' profession?
architect