Marek (bishop of Płock)
Historian Wojciech Kętrzyński considered him as non-historical person, like his allegedly predecessors mentioned by Długosz. Historical of Marek was still doubted by historians. If he was a bishop of Płock, he was bishop since ca. 1075, where the diocese was erected.
- Graczyk, Waldemar (2014). "Historyczność pierwszych biskupów płockich na tle opinii o początkach diecezji płockiej" (PDF). Saeculum Christianum. 21: 77. Retrieved 21 October 2015.
| Bishop of Płock
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