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The Baptistery, known as the giesa dei puti (children's church), occupies
a space to the south of the basilica that was once part of the atrium
and open towards the pier. It is now accessed from the church but originally
the entrance from the small square better identified the three spaces
into which the chapel is divided: the Baptistery Antechamber where the
catechumens awaited the ritual of baptism, the Baptistery proper and the
presbytery. There is much uncertainty about information prior to creation
of the present day chapel in the first half of the 14th century at the
behest of Andrea Dandolo, a highly cultivated humanist and a friend of
Petrarch. He was first procurator of St. Mark's and later Doge (1343-1354).
As for the transformation desired by Dandolo, some scholars have recently
observed that the Doge's intention, over and above giving the church a
new Baptistery with rich mosaic decoration, must have been to celebrate
his own person and his family: the Doge is depicted as an offerer at the
foot of the great crucifixion. The Baptistery mosaics are the last expression
of the Venetian-Byzantine school, already evincing certain Gothic features.
The mosaic decoration centres on two themes: the figure of John The Baptist
and the sacrament of baptism, a means of salvation brought to men by Christ.
On the Baptistery Antechamber barrel vault ceiling are the figures of
the Old Testament prophets. On the walls below there are episodes from
Jesus' childhood interwoven with those from the life of John The Baptist.
The picture opposite the door shows the Baptism of Jesus in the River
Jordan, modelled on Byzantine iconographic canons. These mosaics have
a clearly instructional aim for those who were here awaiting baptism.
In the cupola above the baptismal font, added later to Jacopo Sansovino's
design, Jesus sends the Apostles out into the world to preach and to baptise.
The places of Apostolic preaching are recalled in the inscriptions.
In the small presbytery cupola, Christ in glory among the new angelic
hierarchies is depicted in accordance with an iconography very close to
Byzantine influences. The stories of John The Baptist begin from the lunette
on the right side with the Announcement to Zechariah, Zechariah's Meeting
with Elisabeth and the Stories of St. John, continuing all the way along
the walls and concluding on the left, above the door towards the church
and in the next lunette, with the Dance of Salome and the Martyrdom of
the Saint, two works of extraordinary beauty executed by the last Venetian
mosaicists of the middle ages.
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