of Masovia and of Kujawy (Cuiaviae), has promised and undertaken to provide for him and to his brethren from that land, which is called the Chelmło Land (terra quae vocatur Culmen), and in that other land, that is to say, between his borderland (marchiam) and the territories of the Prussians (confinia Prutenorum), that they may thus indeed take up the task and readily embark upon the invasion and obtaining of the land of Prussia (terram Prusciae) for the honor and glory of the true God. We [that is, Frederick himself] therefore... especially because the land itself is held under the sole rule of the Empire (sub monarchia imperii), trusting also in the judgment (prudentia) of the same Master, because he is a man mighty both in deed and word and through his own and his brethren's perseverance is mightily undertaking and manfully carrying out the conquest of that land... even though many, vainly besought with numerous exertions in this business, gave up (defecerunt) just when they seemed about to set forth, grant the land of Prussia to the same Master along with the forces of his order and with all those who think to invade [it]... This Imperial authorisation was signed by a large number of princes, such as the Archbishops of Magdeburg, Ravenna, Tyre, Palermo and Reggio, the Bishops of Bologna, Rimini, Cesena, Mantua and Tortosa, the Dukes of Saxony and Spoleto, and the Margrave of Montferrat. Later confirmation Treaty of Kruszwica Duke Konrad actually had no intention of ceding the Chełmno Land and initially supported bishop Christian of Oliva establishing the Order of Dobrzyń (Fratres Militiae Christi). Konrad vested the few brethren with the Dobrzyń Land, who however, were not able to secure the borders of Masovia. The Teutonic Order would only join Konrad after receiving a ducal guarantee and the procurement of a papal bull. On 16 June 1230, the Treaty of Kruszwica was supposedly signed, according to which Duke Konrad ceded the lands of Chełmno as well as all other conquests in Prussia to the Teutonic Knights, represented by Grand Master Hermann von Salza. The Livonian Brothers of the Sword and the Order of Dobrzyń were incorporated into the Teutonic Order in 1237. The text of the document is only known by later references, as the original has not been preserved. According to the historian Max Perlbach (1848-1921), the Teutonic Order had in fact forged this