12/10/2014 11:29 EST | Updated 02/09/2015 05:59 EST

Palace: Monaco's Princess Charlene gives birth to royal twins, Gabriella and Jacques

MONACO, Monaco - Palace officials say Monaco's Princess Charlene has given birth to royal twins, a girl and a boy.

The girl was born first, but the boy will be the principality's future ruler.

The royal twins Gabriella Therese Marie and Jacques Honore Rainier — born Wednesday to Charlene, 36, and Prince Albert II, 56 — are heirs to the centuries-old Grimaldi dynasty that rules the wealthy principality.

Cannon fire was programed to mark the babies' birth, the first time twins have been born to Monaco's royal family since its founding in the 13th century.

Monaco is a two-square kilometre (0.8 square mile) enclave of ritzy apartments and luxury shops on the French Riviera with a population of around 30,000.