When Bartholomaeus Welser IV. was born about 1427, in Augsburg, Bavaria, Germany, his father, Bartholomaeus Welser, was 47 and his mother, Catharina Riedler, was 31. He had at least 5 sons and 4 daughters with Elisabetha Meuttung. He died in 1484, in his hometown, at the age of 57.