This video illustrates the grim death of the saint Lawrence who was put to death during the persecutions of the Christians by the Emperor Valerian (reign: 253-259).

As deacon in Rome around 257-258, Lawrence was charged with the responsibility for material goods of the Church, and distribution of alms to the poor. St. Ambrose of Milan relates that when St. Lawrence was asked for the treasures of the Church he brought forward the poor, among whom he had divided the treasure as alms. "Behold in these poor persons the treasures which I promised to show you; to which I will add pearls and precious stones, those widows and consecrated virgins, which are the church's crown." The prefect was so angry that he had a great gridiron prepared, with coals beneath it, and had Lawrence's body placed on it (hence St. Lawrence's association with the gridiron). After the martyr had suffered the pain for a long time, the legend concludes, he made his famous cheerful remark, "I'm well done. Turn me over!" From this derives his patronage of cooks and chefs.

Some historians, such as Patrick Healy, view the traditions of how Lawrence was martyred as "not worthy of credence", as the slow lingering death cannot be reconciled "with the express command contained in the edict regarding bishops, priests, and deacons (animadvertantur) which ordinarily meant decapitation." A theory of how the tradition arose is put forward by Pio Franchi de' Cavalieri. He postulates that it was the result of a mistaken transcription, the accidental omission of the letter "p" -- "by which the customary and solemn formula for announcing the death of a martyr -- passus est ["he suffered," that is, was martyred] -- was made to read assus est [he was roasted]." The Liber Pontificalis, which is held to draw from sources independent of the existing traditions and Acta regarding Lawrence, uses passus est concerning him, the same term it uses for Pope Sixtus II (martyred by beheading during the same persecution).

My note: The information above is an extract from Wikipedia.
My commentary upon the inscription from 1130 is based upon one publication by Anna Blennow on San Lorenzo in Lucina.