Lucius Quintus Modestus

Lucius is the main character of Thermae Romae.

Overview
Lucius is a skilled engineer and architect for Rome. For unknown reasons, if he - while in a dilemma - slips into a body of water and sinks to the bottom he will temporarily be transported to modern day Japan where he will discover a way to solve his issue.

Lucius' knowledge and talent eventually makes him the lead architect for the emperor Caesar Publius Aelius Hadrianus and his successor Lucius Aurelius Caesar.