15. Although the frescoes in this church have long been attributed to Giotto, the tradition that he painted them has long been the subject of intense debate, which continues today.
From Quiz Paintings of Giotto
Answer:
The Basilica of St. Francis in Assisi
Giotto's authorship of the Assisi frescoes was accepted as fact up until the late 18th century, when a Franciscan art historian named Guglielmo della Valle suggested that Giotto might not have painted all of the frescoes. Della Valle noted that there were numerous stylistic discrepancies among the frescoes, and theorized that more than one artist had worked on them. Since then, a debate has ensued as to whether Giotto was solely responsible for the frescoes, whether he was one of several artists who had a hand in their painting, or whether he had painted at Assisi at all (the friary records of the time, which could have settled the matter, were lost or stolen during the Napoleonic invasion of 1809). Some have noted certain discrepancies from Giotto's typical style; others have argued that Giotto, like any artist, was human, and that these discrepancies are merely indications of his evolving style and sensibilities.
There are several details in the Assisi frescoes that seem consonant with Giotto's unique style. An architect as well as a painter, Giotto's skill at rendering architectural detail can be noted in such panels as "The Expulsion of the Demons From Arezzo". His skill at expressing human emotion through facial expression can also be noted in the faces of the mourners surrounding the dead knight of Celano, and those surrounding the dead St. Francis himself in the scene of his death and the "Lament of the Poor Clares". The figure of a young man climbing a tree in the latter fresco also bears a resemblance to two similar figures in the "Entry of Christ into Jerusalem" in the Arena Chapel. However there are also certain stylistic incongruities, such as the excess of extraneous details in such scenes as "The Celebration of Christmas at Greccio" and "The Death of the Knight of Celano" which detract from the central figures. In the latter half of the last century, restorer Leonetto Tintori and art historian Millard Meiss conducted an analysis of the Assisi frescoes and determined that they had been painted over a period of well over a year, and that it seemed likely that at least three artists had worked on them. Assuming that Giotto was one of the three, this theory would explain both the similarities and discrepancies which can be seen in the Assisi frescoes. Portions of the frescoes were damaged in a devastating earthquake in 1997 (which also claimed several lives), but a restoration is underway.