No one but the Pope in Rome could decide it.
There is no apparent reason why Bruno left Toulouse, except the restlessness which had become a marked feature in his character.

We find him at Paris in 1579, where he at once began to lecture at the Sorbonne.
It seems to have been his practice now in every town he visited, to combine private instruction with public disputation.

His manners were agreeable; his conversation was eloquent and witty.

He found no difficulty in gaining access to good society, especially in a city like Paris, which was then thronged with Italian exiles and courtiers.
Meanwhile his public lectures met with less success than his private teaching.

In conversation with men of birth and liberal culture he was able to expound views fascinating by their novelty and boldness.