A hypocaust was an underfloor heating system found in many ancient Roman villas. Hot air from a furnace heated the spaces under the floor and around walls.
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The Roman Numeral system is considered a base ten system.
The Roman numeral system was derived from the Etruscan numeral system and the Etruscans once ruled the Romans.
The Roman numeral system was started by the Etruscans who once ruled the Romans.
The Roman numeral system does not use the letter A.