Left-handed people have same genetic code abnormality as those with situs inversus

When one looks at the evidence for individual claims though (rather than just taking the word of numerous websites for granted), the issue immediately clouds still further. For example, the case for Alexander the Great being left-handed is tenuous at best. His constant inclusion at the top of lists of left-handers is a relatively recent phenomenon, apparently arising from a misreading of accounts in the 1960s and thereafter, and possibly arising from his own (entirely unsubstantiated) claim to have conquered a country of left-handed people. In fact, Alexander is always shown in classical depictions as right-handed, and none of the contemporary or near-contemporary historians, who documented his life so meticulously, make any mention of an unusual trait like left-handedness.

The notable Egyptian Pharaoh Ramses II is usually numbered among the host of left-handers, presumably on the strength of the tomb inscription in which he claims "with my left hand I hurled the dart", totally ignoring the next line which reads "with my right I swung the blade". Incidentally, neither does this make him ambidextrous (what is a man wielding two weapons to do?)

It is not at all clear why Julius Caesar should be considered a left-hander, as he usually is. There does not appear to be any documentary evidence to suggest it, and to assert that he encouraged the Roman practice of shaking the right hand in greeting because he was left-handed (and therefore, presumably, unscrupulous) is circular reasoning of the highest order. The common inclusion of the Roman Emperor Commodus in such lists is even more puzzling. Although almost definitely a left-hander, and a fierce and merciless fighter, Commodus was one of Rome's worst Emperors and a poor military leader. Interestingly, Emperor Tiberius was also a left-hander according to biographer Suetonius, and a much better military leader, but he is hardly ever mentioned in the lists. All this merely demonstrates the tendency for websites and blogs to copy each other unthinkingly.