Yaakov Yanki Teppler concentrates mainly on the second century CE, and includes two basic questions: the question of the earliest text of the twelfth blessing of the central Jewish prayer composed at that time, Birkat haMinim; and the question of the identity of those minim who are cursed in this blessing. In the first section, the author analyzes the blessing itself. In the second section, which concerns the question of its principal objects, he sets out on a quest for the characterization of the minim, using all the hundreds of sources which deal with them. Having united these two sections in one framework, a proposal is made as to the identity of the minim. This proposal should provide a coherent basis for further research on this subject, laying a firm foundation for understanding the processes of separation between Judaism and Christianity in this stormy and fascinating period.