A number of fictitious legends relate to this Clock.
For a long time it was believed that it was built sometime around 1490 by a clockmaster Jan Ruze (Hanus) and his assistant Jakub Cech.
It has only been possible in recent times to prove convincingly that the Prague Astronomical Clock is considerably older and that it was made in the year 1410.
It was constructed by the clockmaker Mikulas of Kadan in collaboration with Jan Ondrejuv called Sindel, professor of mathematics and astronomy of Prague Charles University.