This chapter proposes a model of syntactic annotation for the Parallel Corpus of Old English Prose, an aligned corpus of Old English and Present Day English texts. The research focuses on areas of syntactic divergence between the aligned texts. Syntactic divergence is described in terms of four types of alignment asymmetry (markedness, constituency, order, and configuration) and is represented by means of two components: a structural description and a dependency tree. The main conclusion is that these two components constitute a historical micro-grammar that identifies stability and change with respect to specific categories and constructions.