What is "iry-hor"

Iry-Hor or Ro (as read by the Egyptologist Flinders Petrie) was a predynastic pharaoh of Upper Egypt during the 32nd century BC. Until recently, Iry-Hor's existence was debated, with the Egyptologist Toby Wilkinson contesting the reading and signification of his name. However, continuing excavations at Abydos in the 1980s and 1990s and the discovery in 2012 of an inscription of Iry-Hor in the Sinai confirmed his existence. Iry-Hor is the earliest ruler of Egypt known by name and possibly the earliest historical person known by name.