Only two periods are possible: the early months of 1218 (Potthast, 5739 and 5747) and the winter of 1220-1221.

At any other time one of the three was absent from Rome.
On the other hand we know that Ugolini was in Rome in the winter of 1220-1221 (Huillard-Breholles, _Hist.

dipl._, ii., pp.

48, 123, 142.Cf.Potthast, 6589) .-- For Dominic see A.SS., Aug., vol.i., p.503.The later date is imperative because Ugolini could not offer prelatures to the Brothers Minor before their explicit approbation (June 11, 1219), and this offer had no meaning with regard to the Dominicans until after the definitive establishment of their Order.
[13] See the imperial letters of February 10, 1221; Huillard-Breholles, vol.ii., pp.

122-127.
[14] 2 Cel., 3, 86; Bon., 78; _Spec._, 27b.
[15] Vide K.Eubel: _Die Bischoefe, Cardinaele und Paepste aus dem Minoritenorden bis_ 1305, 8vo, 1889.
[16] He was in Northern Italy.