It is certain also that their allegations came to Bayezid and in the second half of March, the Ottoman forces march in to Serbia. It is not known what they did in Serbia, but it is known that they had no others campaign on any of the neighboring countries, because of such an attack does not have data. During the spring, Stefan's mother, a nun Eugene with monk Jefimija went to Bayezid, to smooth the relations between them. They have returned to Serbia prior to 23 May and managed to ensure that Stefan is received by Bayezid and justify himself before the sultan. In addition, they are brought from Bursa and the relics of St. Petka, which are most likely located in the castle church in Kruševac, Lazarica.