Sons of Manann

The Sons of Manann are the most numerous of all of Manann’s knightly orders, although they lack the prestige and wealth of their great rivals, the Knights Mariner. The Sons of Manann are ill-thought of by the leadership of the cult of Manann in Marienburg, often derided as land-lubbers and viewed as lapdogs to the Emperor. Whilst most would disagree on principal, it is certainly true that the Sons of Manann look far more towards Altdorf than Marienburg, and their chapterhouses are almost exclusively found within the Empire. 1a 1b

The Order
In recent years, the Sons of Manann have become more active in the northern provinces of the Empire. Uniting to defend their countrymen from Norse despoilers hailing from the frozen peaks of Norsca, they have begun to fortify the northern shores against attack.1b

So successful have they been and so quickly has their reputation for vigilance and honour spread that they are positively inundated with fresh-faced recruits looking to give their lives to the service of the sea.1b

Knights
Clad in turquoise and white-enamelled armour, the Sons of Manann are a common sight in the coastal towns of the northern Empire. They fight with weapons true to their marine heritage—cutlasses and bucklers, chosen to allow them to fight freely on the rolling deck of a ship.1b

When not fighting at sea, the Sons of Manann ride great white horses into battle, said by many who witness their charge to be no mortal creatures, but great elementals of wave and water. Of course this is untrue, but the Sons of Manann like to foster the impression all the same. Their steeds are trained in the surf along the northern shores, giving them great strength and endurance unmatched by the horses of other orders. From horseback, the Sons of Manann often spurn the lance, preferring to use wicked tridents instead in honour of their patron God.1b

Source
Warhammer Fantasy RPG 2nd ED -- Tome of Salvation

pg. 207

pg. 208