Short answers, pulled from the story.
Cleopatra VII Thea Philopator was Queen of the Ptolemaic Kingdom of Egypt from 51 to 30 BC and the last active Hellenistic pharaoh. She was a member of the Ptolemaic dynasty, descended from Ptolemy I Soter, a Macedonian Greek general and companion of Alexander the Great.
Cleopatra died on the 12th of August 30 BC, at age 39, after Octavian's forces took Egypt and she refused to be paraded in a Roman triumph. The popular belief is that she allowed an asp or Egyptian cobra to poison her, though no snake was found with her body and accounts differ on the method.
Cleopatra belonged to the Greek-speaking Ptolemaic dynasty, and her first language was Koine Greek. She was the only Ptolemaic ruler known to have learned the Egyptian language, along with several others.
Cleopatra had a private affair with Julius Caesar that produced a son named Caesarion, and after Caesar's assassination she had a relationship with Mark Antony that produced three children. Despite her reputation as a seductress, she had only two known sexual partners, Caesar and Antony.
Octavian portrayed the Donations of Alexandria, which made Cleopatra's children rulers of various territories, as treason, and Rome declared war on Cleopatra rather than Antony in 32 BC. Octavian's forces then defeated Antony and Cleopatra's fleet at the Battle of Actium in 31 BC.
After Cleopatra's death, Egypt became a province of the Roman Empire, marking the end of the Hellenistic period in the Mediterranean. Her son Caesarion was executed around the 29th of August 30 BC on Octavian's order.
Cleopatra's legacy survives in ancient Roman busts, coins, sculptures, and reliefs, and in Renaissance and Baroque operas, paintings, and dramas. The fullest surviving account of her life is Plutarch's Life of Antonius, and she became a pop culture icon of Egyptomania since the Victorian era.