Unlike other Catholic factions (that is if Armenia could be considered a Catholic faction at all) the Norse do not train cavalry from the Nobles' Court. Instead, the role of Order Knights (and their command functions) are taken over by a group of nobles collectively called Stormenn (in Norse, "great men" or "magnates"), who share the same offensive stats, but fight as heavy infantry instead. However, Stormenn are armed with axes and warhammers, and so don't have the splash attack of polearms or the long reach of long spears, nor do they have the speed enjoyed by horse-borne Order Knights. Stormenn, being classified as heavy infantry, are also very vulnerable to missile attacks and must be wisely used. Moreover, only the richest of all Norse kings can afford to recruit these noble warriors, so you will have to be careful. The best use for Norse Stormenn, would be as how other factions use their Chivalric Orders — spread out in small groups to enhance the fighting power of your troops.
Christianity first arrived in Scandinavia with the conversion of the Danes in 1000CE, which soon led to vigorous attempts to evangelise the rest of the Viking lands under Harald Bluetooth, but even so old habits died hard. The Norse, like their Frenchified cousins the Normans, still remained warriors and raiders in heart and while they no longer engaged in widespread pillaging of Christian lands, their piratical habits were however extended further east. While the Normans were conducting the Crusades in the Holy land and Spain, the Christian Norse were pushing eastwards into the Baltic coast in what is known as the Baltic Crusade.