 This story of an eagle which flew from Nuremberg to greet Friedrich III, alongside that of a fly which could circulate the room before returning to its inventor's hand, was spread by Petrus Ramus after a visit to Nuremberg in 1571, and is apparently false.Furthermore, various internet sites instead credit these inventions to a Karel Grod, but little evidence suggests he exists.René Descartes may have attempted to build some automata.