Which Christian groups did Pope Nicholas V negotiate with at the Council of Ferrara-Florence?

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Montúfar, Antonio: Saint Francis of Assisi Appearing Before Pope Nicholas V, with Donors — Nicholas V *Saint Francis of Assisi Appearing Before Pope Nicholas V, with Donors*, oil on canvas by Antonio Montúfar, 1628; in the Los Angeles County Museum of Art. 107.95 × 87.63 cm.

At the Council of Ferrara-Florence, the future Pope Nicholas V (then known as Tommaso Parentucelli) led negotiations with the Armenians, Copts, and Jacobites to address and resolve their doctrinal differences with the Latin Church.1

While the council is widely recognized for its primary focus on the attempted reunion between the Latin Church and the Greek Orthodox Church—represented by the Byzantine emperor John VIII Palaeologus and the patriarch Joseph II—Nicholas V played a specific diplomatic role in these additional ecumenical discussions.231