Eje cronológico 1ª evaluación. By Adriana Segura Hernández. Jan 4, 1560 Ancient Régime. The ancient régime is a ser of political , social and economic estructures of The 18 TH century. Period: Jan 2, 1689 to Jan 2, 1800 Rousseau. Its a really important figure for The end of The Ancient Régime , because of The ideas and The need of social contract.