The study in red chalk on the verso is for a figure in the Martyrdom of Saint Stephen, 1597, now in the Galleria Palatina, Palazzo Pitti, Florence (F. Faranda, Ludovico Cardi detto il Cigoli, Rome, 1986, no. 23). The sketch compares with figure studies in the Accademia in Venice and relates to the man hurling stones in the squared composition drawing at the Istituto Nazionale per la Grafica, Rome (inv. F.C.124194r).
Cigoli appears to have taken up the sheet later and used the other side for another purpose. The pen drawing of the robed man standing, turning left while looking appears to be an idea explored for the Apostles in the fresco for the dome of the Cappella Paolina in Santa Maria Maggiore, Rome, circa 1610 (F. Farando, op. cit., no. 83).
We thank Professor Miles Chappell for having confirmed the attribution on the basis of a photograph and for his kind help in cataloguing this drawing. He will include it in his forthcoming catalogue of drawings by Cigoli.