Check the information Open Archives has about Van Bretagne.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Van Bretagne.
The Family tree Mark de Jong publication was prepared by M. de Jong (contact is not possible).
When copying data from this family tree, please include a reference to the origin: M. de Jong, "Family tree Mark de Jong", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-mark-de-jong/I7232.php : accessed January 30, 2026), "Gwawr Verch-Coel van Bretagne (395-????)".
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Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.