Louis Gayet, Le grand schisme d'Occident Les Origines volume 1 (Paris-Florence-Berlin 1889), "Pièces justificatives", pp. 28-29:

Sub juramento deposuit quae secuntur;

1. Dixit, quod ipse fuit hic in Urbe tempore quo obiit D. Gregorius papa, et post usque nunc, et vidit quod ante factam electionem. Fuit dispositum conclave, et tunc romani dicebant quod Deus voluit quod post longa tempora veniret hic et finiret in Urbe papa, et quod omnino volebant habere papam romanum vel italicum, et incedebant armati, specialiter illa die qua cardinales intraverunt conclave, quod contingit hora vespertina. Et fuit magna copia gentis in platea S. Petri et prope palatium, et dicebant quod per Deum volebant habere papam romanum vel ad minus italicum, alias omnis quanti erant essent cisi pro frustra.

Et sequenti die de mane ivit ad S. Petrum, et vidit prope palatium, et in platea, magnum multitudinem gentium armatarum, sed hoc non erat multum de mane, quia iste non audiebat cito venire, propter commotionem populi. Et loquebantur romani inter se, dicentes quia ista vice volebant habere papam romanum vel italicum, alias omnis occiderentur. Et plures dicebant quod esset magnum scandalum personarum, et clamabant terribiliter, quod Romanum volebant o alo manco, manco italiano. Et dixit quod timuit iste testis valde commotionem populi. Interrogatus si iste testis timuisset si illo tunc fuisset in conclavi, respondid quod quis dubitabat quod quilibet deberet timere illo tempore clamorem et comotionem popul.

2. Item, dixit quod quum iste testis venit, non erat vox aliqua de electione pape, sed post dictum fuit quod D. Sancti Petri fuisset electus, et iste vidit quod aliquibus cardinalibus qui exiverunt per quamdam rupturam prope latrinas, oviaverunt romani, et fuerunt reducti ad palatium irreverenter, et male tractati, inter quos vidit cardinales de Britania [Hugues de Montelais], et Sancti Angeli [Guillaume Noellet], et Gebennensem [Robert of Geneva] et Vivariensem [Pierre de Sortenac] et de Vehernio. Et dixit quod romani rumperunt portas et intrabant per totum volentes rapere omnia, sed conclave non intraverunt nec fregerunt nisi post electionem factam.

3. Item, dixit quod de sero, cum intraverunt conclave cardinales, clamabant romani quod volebant romanum o alo manco italiano, et tota nocte illa clamaverunt terribiliter, et hoc faciebant ex nimia potatione, et non solum bibebant, sed fundebant vinum, et mittebant pro vino ad cellarium pape.

4. Item, dixit quod postquam exierunt conclave, quatuor cardinales remanserunt in domibus suis, alii se posuerunt in castro S. Angeli, et alii recesserunt extra Urbem. Sed post redierunt, et voluntarie coronaverunt eum in papam, et intronizantes eum petierunt ab eo beneficia, et habuerunt illum pro papam, quare iste testis credit et tenet quod sit verus papa Dominus Urbanus.

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The witness, whose name is not given in the manuscript, made the following points:

• He was in the city at the time when Pope Gregory XI died [March 27, 1378] and subsequently until the time of the deposition.
• He witnessed the way the conclave took place before the election. At the time the Romans were saying that God willed that after a long time the Pope should come and remain in the City, and that the wanted to have a Roman or Italian pope.
• They went around armed, especially on the day in which the Cardinals entered conclave. This took place in the evening, and there was a large crowd in the Piazza San Pietro and near the Apostolic Palace, and they were saying that in God's Name they wanted to have a Roman pope or at least an Italian one, otherwise everyone there would be killed in their frustration.
• On the following day (April 8), in the morning he went to St. Peter's and saw the entire palace and square filled with a great multitude of armed men. The Romans were talking to one another that they wanted to have a Roman pope or an Italian one. Otherwise everybody would be killed. Several said that this was a huge riot of people and they were shouting terribly that they wanted a Roman or at least an Italian. When the witness was asked if he would have been terrified if he had been in conclave at that moment, he replied that no one could doubt that anyone at all would have to be afraid at that time of the shouting and commotion of the people.
• When he arrrived, there was no news of the election of a pope, but later it was said that the Cardinal of St. Peter [Francesco Tebaldeschi] had been elected, and he himself saw that the Romans gave an ovation to several cardinals who had exited the palace through a rupture near the latrines. The cardinals were led back to the palace irreverently and were handled badly. Among them he saw five French cardinals (whom he names).
• He saw the Romans breaking down the doors and entering the whole conclave area, intending to steal everything. But they didn't enter the conclave or break down the doors until after the election had taken place.
• After the cardinals had left the conclave, four of them remained in their own homes, others put themselves inside the Castel S. Angelo, others left the City entirely. But afterwards they returned and voluntarily crowned him [Bartolomeo Prignano] pope and enthroned him. They sought benifices from him and regarded him as though he were pope. Therefore, the witness believes and holds that Lord Urban is the true pope.