The Vision of the Cross is located in the Sala di Costantino ("Hall of Constantine"). In the painting, emperor Constantine I is seen just before the Battle of the Milvian Bridge on October 27, 312. According to legend, a cross appeared to Constantine in the sky, after which as seen in the fresco and following Eusebius of CaesareaVita Constantini, he adopted the Greek motto "Εν τούτῳ νίκα", i.e. "By this, conquer", a motto that has been rendered in Latin as "In hoc signo vinces", i.e. "In this sign you shall conquer".
This Mannerist painting is a crowded and confused melee and melange of images, including a dragon, a dwarf, two popes, and various symbols. Proportions among the soldiers appear confused, with some dwarfed by more distant figures.
See also
Chi Rho, the symbol claimed in contemporary versions of the legend
References
Peter J. Leithart. Defending Constantine: The Twilight of an Empire and the Dawn of Christendom. InterVarsity Press, Sep 24, 2010. pg. 71
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