In 1163, the Pope wrote Alfanus to inform him of a plot against King William I of Sicily.
Alfanus passed the information on to his nephew, Florius of Camerota, the justiciar of the principality of Salerno, who in turn warned the king.
On 1 March 1174, the pope confirmed the metropolitan status of the see of Capua and confirmed its suffragans as Aquino, Caiazzo, Calvi, Carinola, Caserta, Isernia, Sessa, Teano, and Venafro: all the churches of the Campania.
In the autumn of 1176, Alfanus accompanied Richard Palmer and Robert of Caserta with twenty-five galleys to Saint-Gilles to take custody of Joan, daughter of Henry II of England, who was betrothed to William II.
It is not known when Alfanus died, but his successor, Matthew, is attested on 13 March 1183.