Pope Pius 12, declared in 1951 that it is possible to be exempt from the normal obligation of parenthood for a long time and even for the whole duration of married life, if there are serious reasons, such as those often mentioned in the so-called medical, eugenic, economic and social `` indications ''.

Pope Pius the Sixth, at Rome, in April, 1778, wrote the following: `` The faithful should be excited to the reading of the Holy Scriptures: For these are the most abundant sources which ought to be left open to everyone, to draw from them purity of morals and of doctrine, to eradicate errors which are so widely disseminated in these corrupt times ''.

** Saint Pope Pius V

* 1953 – Pope Pius XII establishes the Dioceses of Norwich and Bridgeport and makes the Diocese of Hartford an archdiocese.

* 1740 – Pope Pius VII ( d. 1823 )

** Pope Pius X

He was canonized and proclaimed a Doctor of the Church on December 16, 1931 by Pope Pius XI and patron saint of the sciences.

Category: Saints canonized by Pope Pius XI

* 1865 – Astronomer Pietro Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L ’ Immaculata Concezion.

* 1808 – The Roman Catholic Diocese of Baltimore is promoted to an archdiocese, with the founding of the dioceses of New York, Philadelphia, Boston, and Bardstown ( now Louisville ) by Pope Pius VII.

2, " Romani "), made them Referendaries of Favours, and after three years of service, Referendaries of Justice, enjoying the privileges of Referendaries and permitting one to assist in the signatures before the Pope, giving all a right to a portion in the papal palace and exempting them from the registration of favours as required by Pius IV ( Const., 98 ) with regard to matters pertaining to the Apostolic Chamber.

The college was suppressed in 1908 by Pope Pius X and their duties were transferred to the protonotarii apostolici participantes.

* Pope Pius VII ( 1742 – 1823, r. 1800 – 23 )

In 1830, Pope Pius VIII bestowed upon Bernard the title " Doctor of the Church ".

Significant changes came in 1910 with the reform of the Roman Breviary by Pope Pius X.

Pope Pius XII introduced optional use of a new translation of the Psalms from the Hebrew to a more classical Latin.

Pope John XXIII also revised the Breviary in 1960, introducing changes drawn up by his predecessor Pope Pius XII.

The arrangement of the Psalms in the Rule of St. Benedict had a profound impact upon the breviaries used by secular and monastic clergy alike, up until 1911 when Pope St. Pius X introduced his reform of the Roman Breviary.

In 1459 Pope Pius II endowed the University of Basel where such notables as Erasmus of Rotterdam and Paracelsus later taught.

For example, Saint Hermann Joseph had his veneration confirmed by Pope Pius XII.

( As a result of the setting of the age limit at the start of 1971, twenty-five living cardinals, including the last three surviving cardinals elevated by Pope Pius XI, lost the right to participate in a conclave.

Under Pope Julius III, the Council met in Trent ( 1551 – 52 ) for the twelfth through sixteenth sessions, and under Pope Pius IV, the seventeenth through twenty-fifth sessions took place in Trent ( 1559 – 63 ).

The Council entrusted to the Pope the implementation of its work ; as a result, Pope Pius IV issued the Tridentine Creed in 1565 ; and Pope Pius V issued in 1566 the Roman Catechism, in 1568 a revised Roman Breviary, and in 1570 a revised Roman Missal, thus standardizing what since the 20th century has been called the Tridentine Mass ( from the city's Latin name Tridentum ), and Pope Clement VIII issued in 1592 a revised edition of the Vulgate.

* Pope Adrian V ( c. 1205 – 1276 )

In 1452, Pope Nicholas V issued the papal bull Dum Diversas, granting Afonso V the right to reduce " Saracens, pagans and any other unbelievers " to hereditary slavery.

As Pope Martin V supported Sforza, Alfonso switched religious allegiance to the Aragonese antipope Benedict XIII.

In 1589 Pope Sixtus V united to the Congregation of St Ambrose the monasteries of a group known as the " Brothers of the Apostles of the Poor Life " ( or " Apostolini " or " Brothers of St. Barnabas "), whose houses were in the province of Genoa and in the March of Ancona.

The union was confirmed by Pope Paul V in 1606, at which time the congregation added the name of St. Barnabas to its title, adopted new constitutions, divided its houses into four provinces, two of them, St Clement's and St Pancras's, being in Rome.

* 1314 – Pope Clement V ( b. 1264 )

Pope Martin V protested in vain against the inscription on the sarcophagus: " John the former pope ".

This Felix was later confused with a Roman martyr named Felix, with the result that he was included in lists of the Popes as Felix II and that the succeeding Popes of the same name ( Pope Felix III and Pope Felix IV ) were given wrong numerals, as was Antipope Felix V.

While Pope Stephen V supported Guy, crowning him Roman Emperor in 891, Arnulf threw his support behind Berengar.

By the time of Pope Martin V their signature was made essential to the validity of the acts of the chancery ; and they obtained in course of time many important privileges.

Pope Martin V ( Constit.

Pope Paul V, who in early manhood was a member of the College ( Const.

* Pope Celestine V ( 1215 – 96, r. 1294 )

* Pope Urban V ( 1310 – 70, r. 1362 – 70 )

After the murder in that year of Henry III of France, Pope Sixtus V sent Enrico Caetani as legate to Paris to negotiate with the Catholic League of France, and chose Bellarmine to accompany him as theologian.

He received some votes in the 1605 conclaves which elected Pope Leo XI, Pope Paul V, and in 1621 when Pope Gregory XV was elected, but only in the second conclave of 1605 was he papabile.

Under Pope Paul V ( reigned 1605 – 1621 ), a major conflict arose between Venice and the Papacy.

In 1589, by the bull Cum pro nostri temporali munere, Pope Sixtus V re-organised the choir of St Peter's, Rome specifically to include castrati.

Pope Sixtus V limited the number of cardinals to 70, composed of six cardinal bishops, 50 cardinal priests, and 14 cardinal deacons ; however, Pope John XXIII began to exceed the overall limit of 70, and this continued under his successors.