[III. 1.]
It appears that, towards the 17th century, the Emperor Leopold, and several sovereign princes in Germany, conceived a project of re-uniting the Roman Catholic and Lutheran churches. The Duke of Brunswick, who had recently embraced the Roman Catholic religion, and published his Fifty Reasons for his conversion, (once a popular work of controversy), and the Duke of Hanover, the father of the first prince of the illustrious house, which now fills the throne of England, were the original promoters of the attempt. It was generally approved; and the mention of it at the Diet of the Empire was favourably received. Some communications upon it took place between the Emperor and the ducal Princes: and with all their knowledge, several conferences were held upon the subject, between certain distinguished Roman Catholic and Protestant Divines. In these, the Bishop of Neustadt, and Molanus, the Abbot of Lokkum, took the lead. The first had been consecrated Bishop of Tina in Bosnia, then under the dominion of the Turks, with Ordinary Jurisdiction over some parts of the Turkish territories. His conduct had recommended him to Innocent the XIth, and that pope had directed him to visit the Protestant states in Germany, and inform him of their actual dispositions in respect to the Church of Rome. In consequence of this mission, he became known to the Emperor, who appointed him to the See of Neustadt, in the neighbourhood of Vienna. Molanus, was Director of the Protestant Churches and Consistories of Hanover. Both were admirably calculated for the office intended them, on this occasion. Each possessed the confidence of his own party, and was esteemed by the other; each was profoundly versed in the matters in dispute; each possessed good sense, moderation, and conciliating manners; and each had the success of the business at heart, with a fixed purpose, that nothing, but a real difference on some essential article of doctrine, should frustrate the project.
The effect of the first conferences was so promising, that the Emperor and the two Princes resolved, that they should be conducted in a manner more regular, and more likely to bring the object of them to a conclusion. With this view, the business was formally entrusted by both the princes to Molanus alone, and the Emperor published a rescript, dated the 20th March, 1691, by which he gave the Bishop of Neustadt full authority to treat, on all matters of religion, with the states, communities, and individuals of the empire, reserving to the ecclesiastical and imperial powers, their right to confirm the acts of the Bishop, as they should judge adviseable. Under these auspicious circumstances, the conference between the Bishop of Neustadt and Molanus began.
But, before the events which we have mentioned took place, a correspondence on the subject of a general reunion between Catholics and Protestants had been carried on for some time, between Pelisson and Leibniz. The former held a considerable rank among the French writers, who adorned the reign of Lewis the Fourteenth; the latter was eminently distinguished in the literary world. In the exact sciences, he was inferior to Newton alone; in metaphysics, he had no superior; in general learning, he had scarcely a rival. He had recommended himself to the Brunswick family, by three volumes, which he had recently published, on the Antiquities of that illustrious House; and was then engaged in the investigation of its Italian descent, and early German shoots. The result of it, under the title of Origines Guelphicæ, was published, after his decease, by Scheidius, and is considered to be a perfect model of genealogical history. He was also thoroughly conversant in the theological disputes of the times; and in all the questions of dogma, or history, which enter into them.
His correspondence with Pelisson, came to the knowledge of Louisa, Princess Palatine, and Abbess of Maubrusson. She was a daughter of Frederick, the Elector, and Count Palatine of the Rhine, and a sister, of the Duchess of Hanover. In early life, she had been converted to the Roman Catholic religion, and had the conversion of her sister, very much at heart. With this view, she sent to her, the correspondence between Leibniz and Pelisson, and received from her an account of what was passing, between the Bishop of Neustadt, and Molanus. Both the ladies were anxious, to promote the measure, and that Bossuet should take in it, the leading part, on the side of the Catholics. This was mentioned to Lewis the Fourteenth, and had his approbation. The Emperor and both the Princes, by all of whom Bossuet, was personally esteemed, equally approved of it, and it was finally settled that Bossuet and Leibniz, should be joined, to the Bishops of Neustadt, and Molanus, and that the correspondence with Bossuet, should pass through the hands of Madame de Brinon, who acted, as secretary to the Abbess of Maubrusson, and is celebrated, by the writers of the times, for her wit and dexterity in business. Thus the matter assumed, a still more regular form, and much was expected from the acknowledged talents, learning, and moderation of the actors in it, and their patrons.