Which known ruler had the longest royal title?
Answer:
The longest reigning monarch that we know the exact dates of was Sobhuza of Swaziland, who reigned for 82 years from 1899 to 1982. Other monarchs have supposedly reigned for longer, such as Pepi II Neferkare of Ancient Egypt, who ruled for 94 years from 2278 to 2184 BC, but these dates are disputed due to the shortage of evidence.