|Medium||oil on canvas|
|Dimensions||207 cm × 105 cm (81 in × 41 in)|
|Location||Monasterio del Escorial, San Lorenzo de El Escorial (Madrid).|
It shows the apostle standing atop a mountain holding a set of keys, referring to Christ's commission to Peter as "the rock upon which I will build my church. I will give you the keys of the kingdom of heaven." (Matthew 16: 18-19). The heavy drapery and the disproportion between the head and the body are typical of the artist.