Kaspar Rieder worked in Mühlau near Innsbruck. He is recorded from 1452 when he made an armour for Archduke Sigismund of Tyrol. From 1467 to 1492 he was Harnischmeister to the Archduke. He made armour for the King of Naples in 1472; for Burkhart von Knörigen and Rudolf Horb in 1473, in co-operation with Hans Veterlein; for Sigmund von Welsperg in 1478; and for the Emperor Maximilian I in 1496. He is last recorded in 1498.