First is Saint Bavo of Ghent. a Frankish knoght from the 7th century, who first led a wild life, but after his wife died, he changed his life after hearing a sermon of Saint Amandus. he became a monk in the monastery that later carried his name in Ghent, and leter he became a recluse. He is patron of the the bishopric of Ghent and Haarlem (NL), both cathedrals are dedicated to him. (more details on wikipedia)

next is Godelieve of Gistel. a noblewoman from northern France from the 11th century, that was badly treated by her husband, a nobleman from Gistel. later she was strangled on the orders of the husband and thrown into a pool. after her death miracles started to happen and she started to be venerated. She is often represented with a palm (martyr) and a shawl. (more details on wikipedia)

Next is Saint Macarius of Ghent (or of Antioch). According to the hagiography, he was born in modern day Turkey in the tenth century and became archbishop of Antioch, was captured by the Saracens, and tortured while imprisoned (being nailed to the ground, hence the three nails with which he is depicted), he escaped miraculously and started travelling through europe, finally ending up in Ghent, where he was admitted to the monastery by Saint Bavo, he died in 1012 of a plague. more info on him here or here (in English) or on wikipedia (in dutch)

Next is Saint Barbara of nicomedia. a very popular saint in the middle ages and also as the patron saint of mining. she lived in the 3rd century in Nicomedia, was locked up in a tower by her father, where she became christian. when her father discovered she had turned Christian she was tortured by the roman prefect, and later beheaded as she refused to give up Christianity. more info on wikipedia

the last is not a saint, but a martyr Johannes van Upstaele. the parish priest of the church in 1572, when the ‘beeldenstorm’ happened, this was a period during the reformation, where many churches were attacked in order to destroy images and statues. the priest was murdered during the uproar.