Eventually he made his way to
Rome and entered the service of
Pope Innocent X. In 1652 he was elevated to cardinal by Pope Innocent and participated in the
Papal conclave of 1655. He was appointed
papal legate (with Cardinal
Carlo de' Medici) to
Queen Christina of Sweden, who had converted to Catholicism and arrived in Rome in November 1655. In 1671 he was elected
Bishop of Breslau and was subsequently appointed administrator of
Breslau for six months from October 1671. Frederick of Hessen-Darmstadt died in Breslau on 19 February 1682. ==References and notes==