Liber Pontificalis in the context of "Protasekretis"

Clement of Rome (Latin: Clemens Romanus; Ancient Greek: Κλήμης Ῥώμης, romanized: Klēmēs Rōmēs; died c. 100), also known as Pope Clement I, was the Bishop of Rome in the late first century. He is considered to be the first of the Apostolic Fathers of the Church.

Little is known about Clement's life. Tertullian claimed that Clement was ordained by Saint Peter. Early church lists place him as the second or third bishop of Rome. Eusebius, in his book Church History mentioned Clement as the third bishop of Rome and as the "co-laborer" of Paul. In Against Heresies, Irenaeus described Clement as the successor to Anacletus, who was the third bishop of Rome, and as a personal acquaintance of the Apostles. According to the Annuario Pontificio, Clement was the fourth bishop of Rome, holding office at the very end of the 1st century. It is likely that Clement died in exile, and was possibly martyred. According to apocryphal stories dating back to the 4th century by authors such as Rufinus, Clement was imprisoned by Roman Emperor Trajan, and was executed by being tied to an anchor and thrown into the sea. The Liber Pontificalis states that Clement died in Greece in the third year of Trajan's reign, or 100.

Aistulf (also Ahistulf, Haistulfus, Astolf etc.; Latin: Aistulfus, Italian: Astolfo; died December 756) was the Duke of Friuli from 744, King of the Lombards from 749, and Duke of Spoleto from 751. His reign was characterized by ruthless and ambitious efforts to conquer Roman territory to the extent that in the Liber Pontificalis, he is described as a "shameless" Lombard given to "pernicious savagery" and cruelty.

The Basilica of Sant'Apollinare Nuovo is a basilica church in Ravenna, Italy. It was erected by the Ostrogothic king Theodoric the Great as his palace chapel during the first quarter of the 6th century (as attested to in the Liber Pontificalis). This Arian church was originally dedicated in 504 AD to "Christ the Redeemer". It's present dedication dates only from the 9th century. The basilica's current façade, which features a portico, dates to the 16th century, while the adjacent tower dates to the 10th century.

It was reconsecrated in 561 AD, under the rule of the Byzantine emperor Justinian I, under the new name "Sanctus Martinus in Coelo Aureo" ("Saint Martin in Golden Heaven"). Suppressing the Arian church, Justinian rededicated the church to Saint Martin of Tours, a foe of Arianism. According to legend, Pope Gregory the Great ordered that the mosaics in the church be blackened, as their golden glory distracted worshipers from their prayers. The basilica was renamed again in 856 AD when relics of Saint Apollinaris were transferred from the Basilica of Sant'Apollinare in Classe because of the threat posed by frequent raids of pirates from the Adriatic Sea.

The Catacomb of San Lorenzo or Catacomb of Cyriaca is a five-level catacomb on via Tiburtina under the church of San Lorenzo fuori le mura in the modern Tiburtino quarter.

Its most common dedication in the ancient sources is to Saint Laurence, buried in it - the mid 4th century Depositio martyrum states he was buried on 10 August "in Tiburtina" but does not give a name for the cemetery, showing that by the time of writing it was already named after Laurence. Other sources name it after Ciriaca, owner of the land on which it was dug - the Liber Pontificalis and a 6th century martyrdom account of Saint Laurence states he was buried "on the via Tiburtina in land belonging to the widow Cyriaca in the ager Veranus", whilst 8th century sources even call her "beatus".