The Responsa of R. Benjamin b. Matathias, as Illustrating the Development of the Halaha Between the Age of R. Asher b. Jehiel, Author of the Turim (1250-1328) and R. Joseph Karo, Author of the Shulhan Aruch (1488-1575); and as a Source for the Political, Religious, Communal, Economic, Social, and Cultural Conditions in the Last Quarter of the 15th Century and the First Half of the 16th Century, in the South East of Europe