What works did Giotto create in Rome?

Three principal works are attributed to the Italian painter Giotto during his time in Rome:

• The Navicella: A large mosaic titled Christ Walking on the Water, located over the entrance to St. Peter’s Basilica. While the commission is certain, the work was largely remade in the 17th century.1
• The Stefaneschi Altarpiece: An altarpiece commissioned by Cardinal Stefaneschi. Although it bears the Cardinal's portrait, its quality has led some to question if it was painted by Giotto’s own hand.1
• Boniface VIII Proclaiming the Jubilee: A fresco fragment located in the Basilica of St. John Lateran. Its attribution to Giotto is tentative and based on stylistic similarities to his work in Assisi.1

Additionally, historical records indicate that Giotto painted frescoes in the choir of the old St. Peter’s, though these works are now lost.1