After 1090, the conquest of the Islands by the Normans under Count Roger paved the way for the feudal system. Through this system the Islands passed through the hands of many feuds and friends of the Spanish and Sicilian Crowns. These made the Bormla creek to fit the necessities of various fleets and merchandise. All this activity gave a quicker step to the development of Bormla which had become a favourite spot to live in as the creek also had a very abundant sea and provided shelter for sea-going vessels for both local and foreign seamen.
The arrival of the Sovereign Military Order of the Knights of St. John in 1530 found Bormla with a population of 1,200. The establishing of the Order at Fort St. Angelo contributed to the prosperity of Bormla for another 250 years. During the Great Siege of 1565, the Turkish Army pitched its Royal Camp at the top of St. Margerita Hill and placed its cannons and trenches on the hills of Bormla.
During the days of the Order, Bormla had become a favourite countryside resort and had housed many summer residential places and gardens of prominent people of the Order and the Church. It was fortified with the building of the Firenzuola lines, and later, in 1670, by the Cottonera lines. By time it adopted the coat-of-arms of Grand Master Cottoner as its emblem. In 1722 Grand Master Zondadari, seeing the conspicuous defence of Bormla, honoured the town by proclaiming it ‘Città Cospicua’.
The French occupation witnessed the blocking of its gates by the French troops to prevent the easy and uncontrolled entrance of the population laying siege on the Napoleonic army.