Career
Bonastruc was a prominent citizen in Girona. Whether the summons to the presence of the queen was in any way connected with the lawsuit, or whether the letter of Bonastruc to Zerahiah ha-Levi was wrongly dated, has not been determined. "et quia Bonastruch maestre eruditus in talibus asseritur, ipsum volumus inter ceteros principaliter transmittatis, ministrando eis expensas seu salaria in similibus assueta" (Girbal, ib pp 35, 83).
Hence Bonastruc, together with the rabbis Todros and Ferrer, was sent as a delegate from Gerona.
Bonastruc, who disputed with Geronimo de Santa Fé on February 10, 11, and 15, on one occasion aroused the anger of the pope (who was present) to such an extent that his fellow-delegates became frightened, and on their return bitterly reproached him, saying: "We had not agreed among ourselves to speak as you have done." Bonastruc, together with the rabbis Todros and Ferrer, the delegates from Gerona, conducted the dispute.
The report sent as a circular letter to the community at Gerona was probably not written by Bonastruc.