Cassiopeia A is the remains of a star that exploded about 11,000 years ago. It is one of the brightest radio sources in the sky and when the star that produced it blew up, it should have been visible — and quite spectacular.
Martin Lunn, former curator of astronomy at the Yorkshire Museum in England, and Lila Rakoczy, an independent scholar, say that the supernova might have been the 'royal star' that marked the birth of Britain's Charles II in 1630. During Charles II's reign, propagandists for the Stuarts spoke of the new star and the parallel with the Christ story was obvious. But for centuries most historians had assumed it was just that, propaganda.
Other novae and supernovae in the same period are well-documented. A nova in 1572 was recorded by Danish astronomer Tycho Brahe and another appeared in 1604, known as Kepler's Supernova. But there are no similarly concrete charts of the royal star.