When did Caesar defeats Pompey and forms an alliance with Cleopatra?

Julius Caesar defeated Pompey at the Battle of Pharsalus in 48 BCE during the Roman Civil War. Following Pompey's defeat, Caesar traveled to Egypt, where he formed an alliance with Cleopatra VII in 47 BCE. Their relationship not only solidified political ties but also resulted in the birth of their son, Caesarion. This alliance marked a significant moment in both Roman and Egyptian history.