On 2 July 1522, as the Reform in Zurich was just getting off the ground, Zwingli wrote to the Bishop of Constance his Supplicatio ad Hugonem episcopum Constantiensem. Or, according to its full title- Suplicatio quorundam apud Helvetios euangelistarum ad R. D. Hugonem episcopum Constantiensem ne se induci patiatur, ut quicquam in pręiudicium euangelii promulget neve scortiationis scandalum ultra ferat, sed presbyteris uxores ducere permittat aut saltem ad eorum nuptias conniveat.
That longer title tells the thesis of the work. S.M. Jackson offers this description of the situation-
On July 1st  the Bishop of Constance induced the Swiss annual Diet at Baden to pass a mandate prohibiting the preaching of the Reformation doctrines.
On July 2, 1522, there was signed at Einsiedeln a very earnest “Petition of certain preachers of Switzerland to the Most Reverend Lord Hugo, Bishop of Constance, that he will not suffer himself to be persuaded to make any proclamation to the injury of the Gospel, nor longer endure the scandal of harlotry, but allow the priests to marry wives, or at least to wink at their marriages,” and on July 13, 1522, a similar but not identical petition, entitled “A friendly request and exhortation of certain priests of the Confederacy that the preaching of the Gospel be not stopped, and that no one be offended if the priests, in order to avoid scandal, contract marriages”
The first was in Latin and had eleven signatures, of which Zwingli’s was the last, and was addressed to the bishop; the second was in German, as printed in Zwingli’s works bears no signatures (that it had signatures is, however, stated in its last paragraph), and was addressed to the government of the Confederacy. The two documents are so much alike and so much in Zwingli’s style that probably he was the sole author of them both. Both documents assume that the party addressed is favourable to the preaching of the Gospel, and so inclined to listen to the petitioners’ plea for the removal of all hindrances to its free course. But in both petitions these words about preaching the Gospel are preliminary to what is the true object of these petitions, viz., to obtain from the bishop permission to marry, and to dissuade the government from opposing the permitted clerical marriages, if the bishop allowed them.
In both the doctrine is taught that chastity in a man cannot be preserved unless he have the supernatural gift our Lord is supposed by the petitioners to allude to in Matthew 19:10–12! They very honestly, and with expressions of shame and penitence, confess that they have violated the law of chastity very often, but they plead in extenuation of these offences that God had not seen fit to give them the gift of continence. But as it seems to them that the fact that they live unchastely is prejudicial to the Gospel, and is the occasion of much trouble and reproach to them, they desire permission of the bishop to marry, and also protection for married priests from the State. There is not a scintilla of evidence that the priests who signed these petitions were a whit worse than the other priests about them. What they wanted was permission to contract lawful marriages.
Zwingli at the time he drew up these petitions was living in “clerical” marriage, a union unsanctioned by the Church, but one so connived at and also condoned by public sentiment that the woman he was living with was called his wife.
Of course, these petitions led to no action by those addressed, nor could the signers have expected to do more than to educate public sentiment so that their own contemplated marriages might be less opposed. By coming out so boldly and confessing so humbly, they attested the possession of great courage. Both petitions were printed in Zurich together and sent by Zwingli to the Bishop of Constance. Zwingli’s correspondence shows how active he was in distributing them, apparently in part for signature, and how he viewed signing them.
Here are the signatories-
GEORG STÄHELIN (Calybeus),
HULDREICH PISTORIS (Pfister),
CASPAR MEGANDER (Grossmann),
JOHN FABER (Hans Schmid).