Guglielmo Borremans or Guglielmo Fiamingo (Antwerp, 1670 – Palermo, 1744) was a Flemish painter whose documented career took principally place in Italy, in particular Naples, Cosenza and Sicily. Here he was one of the pre-eminent late-Baroque fresco painters of the first half of the 17th century who received multiple commissions to decorate churches and palaces.
Little is known about the youth and training of Guglielmo Borremans. He is believed to have been born in Antwerp in 1670. Here he trained with the history painter Pieter van Lint around 1688-1689. A painting of the ‘Martyrdom of St Andrew’ formerly in the St Bavo's Cathedral, Ghent is the only documented work attributed to him dating to his residence in his home country. He likely did not leave Flanders before the end of the 17th century. The last evidence of the artist’s presence in Antwerp is found in the records of the archives of the Academy of Fine Arts of Antwerp where he is recorded until 1693.
The exact timing and details of his route to and in Italy are not clear. That the artist may have passed through Rome is made likely by a painting by his hand dated to 1703 that was formerly in the Consentino Duomo in Rome. He also spent time in Napoli and possibly in Cosenza, Calabria. At least 20 works dated from 1703 to 1706 are recorded in Cosenza. He may have had a link with the local members of the Franciscan order as most of his works in Calabria were commissioned by this religious order. In fact, these dated works painted in Cosenza are the earliest indication of his presence in southern Italy.
The only known paintings by Borremans in Naples are the fresco decorations in the crossing of the Santa Caterina a Formiello dating from around 1708-09. He was replacing Giuseppe Simonelli who had died not long before and had commenced the decoration of the crossing. The subject of the series were stories from the life of Saint Dominic.
He must have made quite a name for himself in Naples as the 1713 publication ‘’Selva poetica’’ by Giuseppe D'Alessandro, the Duke of Peschiolanciano, included a poem dedicated to the artist entitled "In lode del Signor Guglielmo Borremans, famoso pittore fiammingo" (‘"In praise of Mr. Guglielmo Borremans, famous Flemish painter’). The final verses of the poem refer to Borremans’ skills at eternalizing the living and to revive the dead, which point to his activities as a portraitist in Naples. To date no painted portraits have been attributed to the artist other than the half-length portrait of the Archpriest Raffaele Riccobene in the altarpiece of the ‘’Immaculata with Angels and Saints’’ for the main altar of the Cathedral of Caltanissetta. Riccobene had funded the decoration of the Cathedral.