Death of Pope Saint Liberius, 36th successor of Saint Peter who ruled for 14 years. Liberius was faced with the polemics with the Arians which led to the election of the antipope Felix II. It was Liberius who laid the foundations for the Basilica of St. Mary Major by tracing out the perimter after a miraculous snowfall on August 15th.
Death of Saint Rupert, first bishop of Salzburg in Austria. He reconverted the pagan temples into Christian churches and established the salt-mining industry in that region, hence the etimology of the name of the city - Salzburg.
Death of Saint Gerard of Csanad who was martyred at Venice. He is often called the "Apostle of Hungary" for bringing the gospel to that region.
Death of Pope Innocent II, 164th successor of Peter whose papacy lasted 13 years. He had hardly been elected when he was forced to flee from Rome. Lothario of Saxony brought him back to Rome, kissed his feet in obedience and personally held his mule's bridle during the procession, in exchange for his own coronation. Innocent convened the 10th Ecumenical Council or Lateran II which brought to an end the Papal schism and enacted reforms in 1139.
Establishment of the feast of Our Lady of Mercy also called Our Lady of Ransom. It was Saint Peter Nolasco who founded an order under the Blessed Mother's protection with the title of Our Lady of Mercy or Ransom with the specific purpose of ransoming Christian prisoners and slaves from the Moors and infidels during the Crusade years. The trend of invoking Our Lady has continued for nearly 800 years of imploring the Mother of Mercy's help in all difficulties.
Pope Saint Pius X issues his last encyclical - his sixteenth - Singulari quadam on labor organizations.