This church's campanile was designed by Giotto, and Ghiberti won a contest to design the doors for its baptistery.
This church's faÃ§ade is topped by a bust of God the Father sporting a triangular halo. The lowest level of one part of this church is covered by a series of hexagonal reliefs depicting the history of man. Paolo Uccello designed the clock above the inside of this church's portal. Emilio de Fabris added pink and green marble to this church's faÃ§ade. One part of this church was supported by four stone and iron [*] chains during its construction, which Arnolfo di Cambio could not complete. This church's campanile was designed by Giotto, and Ghiberti won a contest to design the doors for its baptistery. For 10 points, identify this church by the Arno, crowned by Brunelleschi's octagonal dome. 
This church's faÃ§ade is topped by a bust of God the Father sporting a triangular halo.
Basilica di Santa Maria del Fiore [or Basilica of St. Mary of the Flowers; accept Florence Duomo; accept Florence Cathedral; prompt on partial answer]