Supremi disciplinae
Encyclopedia
Supremi disciplinae was a motu proprio
Motu proprio
A motu proprio is a document issued by the Pope on his own initiative and personally signed by him....

 that reduced the number of Holy Days of Obligation within the Roman Catholic Church
Roman Catholic Church
The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

.

The motu proprio was released on 2 July 1911 by Pope Pius X
Pope Pius X
Pope Saint Pius X , born Giuseppe Melchiorre Sarto, was the 257th Pope of the Catholic Church, serving from 1903 to 1914. He was the first pope since Pope Pius V to be canonized. Pius X rejected modernist interpretations of Catholic doctrine, promoting traditional devotional practices and orthodox...

. It reduced the number of such non-Sunday holy days from 36 to 8. The present list was established in 1917.
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