Although some authors seem uncertain about whether or not Rothschild ever did buy land in the Golan, the balance of evidence seems to suggest that he did.
According to this book, in the 1890s an agent for Baron de Rothschild, Yehoshua Ossowetzky, 'bought large tracts of land in the Golan and other areas east of the Jordan river'. However, according to this book, 'only one colony was established in Transjordan, and not by Rothschild. A group of Jews from the 'Old Yishuv' of Safed banded together in 1886-1887 and attempted to set up the colony of Bnei Yehuda on 14,000 dunams of land which had been purchased from the Circassian village of Rumthaniyya in the central Golan.' But, then, this book says that 'In the end, Rothschild's only major land purchase east of the Jordan was in the Golan, to the north of the Yarmouk river.' This book seems to settle the mystery: on page 161, it says that 'In 1892, the Paris-based Jewish philanthropist Baron Edmond James de Rothschild bought the holdings of these three groups [who had previously acquired land in the Golan]. He ended up owning a large amount of land in several villages in Golan by special order from Istanbul.' This book also has a long section on Rothschild's land purchases in Syria, as does this book.
In addition to the material listed below, which has been explicitly marked as referring to this topic, there may be other material whose text contains the name of this topic. Select material containing the phrase: Edmond de Rothschild's land purchase in the Golan
#148386 Settling Historical Land Claims in the Wake of Arab-Israeli Peace
by Michael R. Fischbach in Journal of Palestine Studies (JPS), Autumn 1997
#171912 A Palestine diary: memoirs of a Bilu pioneer, 1882-1887
by Hayyim Hisin, Frances Miller (introduction and translation from Russian) 1976
#42301 Two Rothschilds and the Land of Israel
by Simon Schama 9 October 1978
#95786 Frontiers of the State in the Late Ottoman Empire: Transjordan, 1850-1921
by Eugene L. Rogan 2002
#5898 Records of Dispossession: Palestinian Refugee Property and the Arab-Israeli Conflict
by Michael R. Fischbach December 2003
#85735 Jewish Property Claims Against Arab Countries
by Michael R. Fischbach July 2008