Martino Alfieri or Alferi (November 1590 – 30 March 1641) was Apostolic Nuncio to Cologne from 1634 to 1639 and he served also as Bishop of Isola and Archbishop of Cosenza.
He completed his studies earning a doctorate in utroque iure in the University of Pavia and then he moved to Rome, where he was ordained priest on 15 April 1623.
[1] In 1627 he became vicar of the Basilica di Santa Maria Maggiore and his ecclesiastic career proceeded with the appointment as referendary of the Tribunals of the Apostolic Signature of Justice and of Grace (which made him a prelate and gave him the right to practice before the Roman courts), member of Fabric of Saint Peter and consultor of the Holy office.
[4] The episcopal consecration followed on 10 September in the Basilica di Santa Maria Maggiore by the hands of Cardinal Giulio Roma.
[2] The planned peace conference however did not succeed to be called due mainly to the caution of the France, the need of obtaining passports for the German Protestant Princes and in general the refusal of Papal mediation.