Château de Beauregard, Medieval castle in Saint-Genis-Laval, France.

Château de Beauregard is a ruined fortified house in Saint-Genis-Laval, entered through a monumental stone doorway with a pointed arch framed by light-coloured blocks. The main building collapsed in 1945, leaving a rough cobblestone wall with an uneven top. The arch opens onto a shadowed passage with a wooden plank ceiling and stone-paved floor. The grounds are arranged in three levels: the terrace of Gadagne, the Grand Jardin reached by a double staircase, and the Bas Jardin with a Renaissance kitchen garden and a rectangular water basin.

The site began as a fortified house founded in the 14th century by Gaspard de Chanvey, chatelain of Saint-Genis-Laval, and was later held by the archbishops of Lyon; Clement V stayed there in 1305 after his coronation. Pierre Gadagne bought it in 1526 for 2,200 gold écus and ceded it to his brother Thomas II, a banker whose wealth gave rise to the Lyonnais saying "riche comme Gadagne", who remodelled it in the Florentine style. In 1564 Thomas III received Catherine de' Medici there during Charles IX's passage through Lyon. The main house collapsed in 1945; the city acquired the estate in 1978.

The name Beauregard is documented from the early 16th century, when the lord was said to hold "a fine and sumptuous house called Beauregard". Thomas II Gadagne, a Lyon banker whose wealth gave rise to the saying "rich as Gadagne", laid out the grounds in the Florentine style of his time. The garden today is a public park; a circular pond facing the double staircase holds water lilies.

The grounds are entered from the north, where a bridge crosses a former moat; the gatekeeper's house, called maison Ricard after the last owner, stands walled up to the right. From the porte de Beauregard a path leads onto the terrace de Gadagne, then a double-flight stair climbs to the Grand Jardin, whose retaining wall holds a nymphaeum and a vaulted orangery gallery beneath the steps. The Bas Jardin lies at the lowest level, south of the circular lily basin.

The vines replanted in 2014 stand on two lower terraces, the terrasse de la Folie and the terrasse du Clapier, flanking a rectangular water basin; the first grape harvest followed in September 2014. A 16th-century account already counted 150 men's worth of vines at Beauregard.