He is related to every reigning monarch in Europe and shares a common ancestor with the Queen in King Henry II.
Prince von Saxe-Lauenberg told BBC Radio Berkshire that he hopes to attend his first match at York Road in April.
Club chairman Una Loughrey added: "It's fitting that we play in the Royal County and have a prince as patron."
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EXTRA: Prince Frederick is also the main advocate for the World Creative Youth Forum (WCYF) 2008 an event that is being planned to be held on December 6-11, 2008 at Bulacan, Philippines. (Related Story here)