Alexander the Great and the Thief

http://news.iskcon.com/node/3914

Raksha bandhan King Porus and Alexander Wife

The ancient reference to the festival of Rakhi dates back to 300 BC at the time when Alexander conquered India. King Alexander of Macedonia also tried to take over the kingdom of the Indian King Porus but he was resisted by King Porus. 


Seeing this, Alexander's wife Roxana got worried and the Greek ruler's wife hastily approached King Porus with a rakhi.
As she knew the custom and importance of Raksha Bandhan, asking him not to harm her husband during the battle.

In the nick of time, I'd say, because in the very next battle Alexander fell off his horse and found Porus holding a sword to his neck. A moment later, Porus let him go. He had promised his sister after all.


Hence, she became a sister of his and this is the reason King Porus restrained himself to deliver the final blow to Alexander which would have taken his life.