According to her tombstone in the German Cemetery in Haifa, Israel, my great grandmother Anna Minna Martha Oldag (her maiden name) was born in Warmbrunn on 10 Oct 1866. I have tentatively identified Warmbrunn as Cieplice, Jelenia Gora, Lower Silesia, now Poland. Anna died in Meissen, Saxony, Germany on 26 Dec 1922, but she lived with my great grandfather in Beirut and possibly Haifa (for a year or two after World War I).
Because she is buried in the German Cemetery in Haifa, there may be a connection to the German Temple Society (https://en.wikipedia.org/wiki/Templers_(religious_believers)), but I have no direct evidence of this. The Templers were a fringe protestant group that engaged in mass emigrations from Germany to regions more conducive to their radical Christian life style. Some moved to Russia, others to Palestine. There were successful Templer settlements in Jaffa, Haifa, Jerusalem, as well as some satellite settlements in other parts of the country.
Comments asked about the religion of my great-grandmother. The short answer is, I do not know. The region where Anna comes from was populated both by Catholics and by Protestants, although during the counter-reformation and the Thirty-Years War the Protestants did not have an easy life there. Anna definitely was not Jewish, and my most likely guess is that she was Protestant (Lutheran or Templer).
I also do not know when and why Anna came to be in the Middle East, who her parents were, or anything like that. It is possible that her parents joined one of the Templer groups that settled in Palestine, but I have found no evidence of this. All I know is that her oldest child was born in Beirut in 1894, and that her ashes were transferred from Germany to Haifa shortly after her death.
I have also been unsuccessful with the usual on-line search engines, Ancestry.com and FamilySearch, even though (or perhaps because?) Oldag is a fairly common last name all through northeastern Germany. Ask for exact matches, you will find none, relax the search parameters, and there are upwards of 20,000 hits. I need a more focussed search strategy. The Silesian region was, of course, ravaged during World War II and changed hands thereafter, so I am not even sure in which jurisdiction I should start my search.