The article presents lexicological reflections on the vocabulary of the writings of Bartłomiej Groicki (1519– 1605). The starting point is the state observed in Słowa prawne w rzeczy sobie podobne, which was a kind of glossary attached to the same author’s Rejestr do Porządku i do Artykułów prawa majdeburskiego (1567). A wide perspective is given on the historical development of the following semantic fields: 1. Names of women; 2. Names of the degrees of kinship and affinity; 3. Names of disputes and litigations; 4. Names of inheritances; 5. Names of prison. The author’s considerations and conclusions are illustrated with rich material excerpted from historical sources.