What is a question about this article? If the question is unanswerable, say "unanswerable".

Cork has been culturally diverse for many years, from Huguenot communities in the 17th century, through to Eastern European communities and a smaller numbers from African and Asian nations in the 20th and 21st centuries. This is reflected in the multi-cultural restaurants and shops, including specialist shops for East-European or Middle-Eastern food, Chinese and Thai restaurants, French patisseries, Indian buffets, and Middle Eastern kebab houses. Cork saw some Jewish immigration from Lithuania and Russia in the late 19th century. Jewish citizens such as Gerald Goldberg (several times Lord Mayor), David Marcus (novelist) and Louis Marcus (documentary maker) played notable roles in 20th century Cork. Today, the Jewish community is relatively small in population, although the city still has a Jewish quarter and synagogue. Cork also features various Christian churches, as well as a mosque. Some Catholic masses around the city are said in Polish, Filipino, Lithuanian, Romanian and other languages, in addition to the traditional Latin and local Irish and English language services.

When was David Marcus mayor of Cork?
unanswerable