"Lady Luck had sat with us"

Possibly first coined by Shakespeare in Hamlet, the phrase 'Lady Luck' is thought to have the Roman goddess of Fortuna as its origin.  She represented the random nature of luck, and was a daughter of Jupiter.  Her Greek equivalent was the goddess Tyche.  She also influenced the concept of The Wheel of Fortune, which was a Medieval idea relating to Fate; Fortuna was said to be the one who turned the wheel.  It later appeared as one of the Major Arcana cards in the Tarot.  The phrase 'Lady Luck' is most commonly used in relation to gambling, where success is more up to chance than skill.