Sextus Julius Frontinus (ca. 40–103 AD) was one of the most distinguished Roman aristocrats of the late 1st century AD: he was grandson of Aulus Julius Frontinus and Cornelia Africana, the only child of Publius Cornelius Scipio. He is best known to the post-Classical world as an author of technical treatises, especially one dealing with the aqueducts of Rome.

In 70 AD, he was praetor, and five years later was sent into Britain to succeed Quintus Petillius Cerialis as governor of that island. He subdued the Silures and other tribes of Wales hostile to Roman invasion, establishing a new base at Caerleon or Isca Augusta for Legio II Augusta and a network of smaller forts fifteen to twenty kilometres apart for his auxiliary units. One of these forts would have been Luentinum, which controlled the gold mine of Dolaucothi, worked by numerous aqueducts. He was succeeded by Gnaeus Julius Agricola in 78. Agricola was the father-in-law of the famous historian Tacitus.

In 95, he was appointed Water Commissioner of the aqueducts (curator aquarum) at Rome by the emperor Nerva, an office only conferred upon persons of very high standing. He was also a member of the College of Augurs. He produced an official report on the state of the aqueducts serving the city of Rome towards the end of the 1st century AD, the first official report of an investigation about engineering works ever to have been published.^{[citation needed]}

Milan Kňažko (born 28 August 1945) is a Slovakian actor and ex-politician. He was one of the leading personalities of the movement Public against Violence in November 1989 and one of the most popular faces of the Velvet Revolution in Slovakia.

He starred in Devět kruhů pekla, which was screened in the Un Certain Regard section at the 1989 Cannes Film Festival.

He had a minor role in the 2007 horror film Hostel: Part 2, where he portrayed an executive of the Elite Hunting.