Craniopagus twins known sets of twins of all time. In history, Castor and Pollux fought Greek battles alongside other famous war heroes like Herkules and Achilles. The Greeks held these twins in high standing and they were seen not just as warriors but as gods. Although there are cases of conjoined twins dating back to as early as the 10th century, it was not until 1491 that the first case was documented. Apart from that, Sebastian Munster’s "Cosmographia universalis" provides the true first account of craniopagus twins who happened to live for ten years, exceeding many expectations during that time. He describes
Monochorionic twins Monochorionic twins Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are "dichorionic diamniotic". If the placenta divides, this takes place after the third day after fertilization. Monochorionic twins generally have two amniotic sacs (called Monochorionic-Diamniotic "MoDi"), but sometimes, in the case of monoamniotic twins (Monochorionic-Monoamniotic "MoMo"), they also share the same amniotic sac. Monoamniotic twins occur when the split takes place after