a very complex question as far as I can see, I did some inqueries, e.g. ****://tinyurl.***/nx698op and ****://tinyurl.***/mfntoht (both sources in German language).
Ask a special lawyer for marriage law for advice.
The European Judicial Network: states the following:
"Where should I lodge my application (petition) for divorce/legal separation/marriage annulment? Which formalities must be respected and which documents should I attach to my application?
The application for the dissolution/annulment of marriage should be made at the family court of the district in which both or one of the parties reside. The application must comply with Model 1 of Procedural Regulations of the Supreme Court of 1990. Proof of postage of the notification sent to the competent bishop or proof of receipt of a registered letter relating to the notification by the competent bishop, as well as the parties' marriage certificate should be submitted along with the application as evidence."
Information source: ****://tinyurl.***/kw6etxq
Maybe the consular department of the cyrpus embassy in Germany can help you: