Assign the armory to produce Ribauldequins.
Assign the armory to produce Great Bombards.
Assign the armory to produce Mangonels.
Assign the armory to produce Springalds.
Assign the armory to produce Trebuchets.
Assign the armory to produce Battering Rams.
Blacksmith
Ranged Damage Technology
Increase the ranged damage of all arrows, bolts, and emplacements by +1.
Istanbul Observatory
Court Architects: Patronage of the finest builders increases all building health by +30%.