Short answers, pulled from the story.
The persecution at Lyon took place in AD 177, during the reign of the Roman emperor Marcus Aurelius, who ruled from 161 to 180. It targeted Christians in Lugdunum, the Roman name for the city now known as Lyon, France.
The martyrs of Lyon numbered 48 in total, half of Greek origin and half Gallo-Roman. Among the most prominent were Pothinus, the first bishop of Lugdunum; the slave Blandina; the deacon Sanctus from Vienne; and a fifteen-year-old boy named Ponticus.
The Christians of Lyon were formally accused of "Thyestean banquets and Oedipean intercourse," a phrase encoding the crimes of cannibalism and incest. These accusations were invented by two pagan servants who fabricated them while fearing torture.
Blandina was a slave who was subjected to extreme torture during the persecution at Lyon. She was first hung on a stake and exposed to wild beasts, none of which touched her. She was later enclosed in a net and set before a bull.
Pothinus was the first bishop of Lugdunum and the founding leader of its Christian community, having come from Asia Minor. Already elderly at the time of the persecution, he was beaten and scourged and died in prison.
The primary source is a letter written by the Christians of Lyon and Vienne, addressed to the churches of Asia Minor, which Eusebius preserved in his Ecclesiastical History, book 5, chapter 1, about 150 years after the events. Gregory of Tours also described the persecution in the 6th century in his De Gloria martyrum.