Hireos is a broad term for a ruler who, whether by fact or by legend, lived significantly longer than the average human lifespan. While some lived for only a couple of centuries, some of the longest-lived Hireos in Riiga were supposedly around a millenium old. Most of them are lived in the Age of the Sun, from around 3000BD - 900BD. The Grey Era, from 900BD - 0BD, also has some Hireos in its records. Very few are said to remain alive today.