It is known that he was born in the morning, because according to the Chronicle of Greater Poland, when Dowager Duchess Elisabeth gave birth to a son, the vicars and canons of the city were singing morning prayers.
Diketahui bahwa ia dilahirkan di pagi hari, karena menurut Kronik Wielkopolska, ketika Permaisuri Elżbieta melahirkan seorang bayi laki-laki, para pastor dan kanon kota sedang menyanyikan doa pagi.