 Complete the following phrase:  In 1530, the Maltese islands along with the North African port city of Tripoli were given to the Order of Saint John by Emperor Charles V. The knights settled in the town of Birgu and made it their capital. Soon after their arrival, the Order rebuilt the Castrum Maris, calling it Fort Saint Angelo. Later on, the entire town of Birgu began to be surrounded by new fortifications, in a similar style to the Orders earlier defences in Rhodes. Birgus land front was built by 1540. Following the 