Democratic Senator Bernie Sanders dropped out of the race for US president.
Source
Roman Emperor Caracalla was stabbed to death by a guard while urinating.
NASA's Discovery space shuttle launched on mission STS-56.
One of the world's most important medieval castles, Krak des Chevaliers, was conquered by Sultan Baibars.
The first idea of a fire escape was patented.
Construction of the Bahrain World Trade Center was officially completed.
