Pope Honorius I
Reigned from 625 to 638.
Born in the Campagna, Italy; died in Rome, Italy.
As pope he did much for the embellishment of ecclesiastical Rome, arranged for the conversion of the West Saxons, bestowed the pallium on Saint Paulinus of York and Honorius of Canterbury, and urged the Irish to adopt the Roman system of reckoning Easter.
He died with an untarnished reputation but notoriety has come to him from the fact that he was condemned as a heretic by the Sixth General Council, 680, which based its condemnation on a letter of his to Sergius, Patriarch of Constantinople.
The latter wrote for advice on an expression relating to the Incarnate Word which was being used to refute the Monophysite heresy, and which he considered not in accord with Catholic doctrine.
The papal answer, which was undogmatical, smoothed over the error and gave no decision, but since Honorius neither defined nor condemned anything and did not speak ex-cathedra, the papal infallibility was not involved.
However, the idea prevails that Honorius may have been wrong in fact but not in intention.
New Catholic Dictionary