The first of the three, Jacobus, is the father, Wenceslaus and Joannes are the sons. The first three dates are the dates of the announcements, the fourth is the wedding date. Catholic weddings typically required three announcements in the parish churches of both bride and groom before the marriage could go ahead. Only in extraordinary circumstances could these announcements be dispensed with (i.e. the bride gave birth within a few days of the wedding, etc.)