1. It is with the greatest pleasure that I contribute this paper to this volume published for my dear friend Reuven Yaron. He was one of the very first foreign colleagues whom I invited to give lectures for the students of the Amsterdam Law Faculty some months after my appointment in 1965, and eight years ago Reuven Yaron was a visiting professor at our University for a period of six months. On that occasion he read fascinating papers on Ancient Near Eastern laws and brilliantly participated in my Papinian-seminar, where also other participants such as Eric Pool and Laurens Winkel made numerous astute remarks. I therefore decided to make Papinian's text D. 17.2.81, concerning societas omnium bonorum and dos, the main topic of my contribution to this volume published in honour of Reuven Yaron. However, I found in the Digest-title 17.2 two additional texts by other classical lawyers, viz. Paul and Gaius, in which they also examine problems in connection with societas omnium bonorum and dos (D.17.2.65.16 and D.17.2.66). It is instructive to discuss these three texts together in this paper. In each of the three texts the situation is different. In the cases that Paul and Gaius deal with, it is the husband who, having received a dowry, is a socius omnium bonorum (Situation I). In Papinian's text which is — even for Papinian! — exceptionally rich in legal ideas, the lawyer gives solutions for many legal questions in a situation, wherein a father, being one of two socii omnium bonorum, promised or gave a dowry to his son-in-law on behalf of his daughter (Situation II).