In 1245, Innocent IV issued bulls and sent
an envoy in the person of Giovanni da
Pian del Carpine (accompanied
byBenedict the Pole)
to the "Emperor of the Tartars" The message asked the Mongol ruler
to become a Christian and stop his aggression against Europe. The Khan Güyük replied
in 1246 in a letter written in Persian that
still rests in the Vatican Library, demanding the submission of
the Pope and the other rulers of Europe.
The well with pulleys
