<p>Childhood friends, <a href="https://www.nationalgeographic.com/history/world-history-magazine/article/alexander-the-great-murder-conspiracies-history">Alexander the Great</a> (right) and his general Hephaestion (center) were close companions for their whole lives. Many historians believe the two were lovers, but ended the amorous side of their relationship when it was time to marry and start a family. Hephaestion remained a trusted favorite of Alexander throughout his career. His sudden death in 324 B.C. deeply affected Alexander, who openly mourned him. They were said to look so much alike, that some couldn't tell them apart.</p>

Alexander the Great and Hephaestion

Childhood friends, Alexander the Great (right) and his general Hephaestion (center) were close companions for their whole lives. Many historians believe the two were lovers, but ended the amorous side of their relationship when it was time to marry and start a family. Hephaestion remained a trusted favorite of Alexander throughout his career. His sudden death in 324 B.C. deeply affected Alexander, who openly mourned him. They were said to look so much alike, that some couldn't tell them apart.

Ann Ronan Pictures, Print Collector/Getty

Who were history's top ten, red-hot power couples?

Harnessing their passion and ambition, these ten couples dominated their times—building empires, creating masterpieces, and breaking boundaries.

In mid-February, hearts and minds turn to love as Valentine’s Day approaches. The power of love is a glorious thing, especially when two people are able to channel their connection to reach new heights. From Caesar and Cleopatra to Frida and Diego, history’s power couples transformed their worlds as they came together and broke apart.

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