| Date | Age | Event | Title | 
|---|---|---|---|
| 20 Feb 1744 | Born | ||
| 27 Feb 1768 | 24.0 | Ordained Priest | Priest | 
| 17 Feb 1777 | 32.9 | Appointed | Archbishop of Ferrara, Italy | 
| 23 Feb 1777 | 33.0 | Ordained Bishop | Archbishop of Ferrara, Italy | 
| 12 Jul 1779 | 35.3 | Elevated to Cardinal | In Pectore | 
| 22 May 1782 | 38.2 | Elevated to Cardinal | |
| 27 May 1782 | 38.2 | Appointed | Cardinal-Priest of Santa Balbina | 
| 3 Apr 1786 | 42.1 | Appointed | Cardinal-Priest of Santa Maria in Ara Coeli | 
| 2 Apr 1800 | 56.1 | Appointed | Cardinal-Bishop of Palestrina | 
| 27 Mar 1809 | 65.1 | Appointed | Cardinal-Bishop of Porto e Santa Rufina | 
| 26 Sep 1814 | 70.5 | Appointed | Cardinal-Bishop of Ostia (e Velletri) | 
| 14 Jun 1815 | 71.3 | Appointed | Prefect of the Congregation of Ceremonies | 
| 10 May 1817 | 73.2 | Appointed | Archpriest of the Basilica di San Pietro in Vaticano {Saint Peter Basilica} | 
| 20 Apr 1820 | 76.1 | Died | Cardinal-Bishop of Ostia (e Velletri) | 
Alessandro Mattei
Alessandro
Cardinal
Mattei
(born , died )
Cardinal-Bishop
of Ostia (e Velletri)
  | 
| Event | Place | 
|---|---|
| Birth Place | Roma, Diocese of Roma {Rome}, Italy | 
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