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The Household Grade is a rating used to classify the size of a Knight House by the number of operational Knights. [[House Vyronii]] was given the Household Rating of "Primus Belicosa", a rating denoting the high number of knights the house was able to field, when the estimate of fieldable knights was "500 or so". When a further audit was conducted the number was placed at "roughly 600", making it the largest Knight House known to be operating along the [[Eastern Fringe]].{{Fn|19}} Within months of beginning a supply relationship with agents of [[Warmaster]] [[Horus]], [[House Makabius]], a Secundus Grade household, swelled to "nearly 200 fully equipped Knights".{{Fn|20a}} At the outbreak of the [[Horus Heresy]], [[House Orhlacc]] was believed to possess as many as 300 knights, placing it at the "higher end" of the Secundus rating.{{Fn|20b}} The [[Sons of Horus]] falsely claimed that [[House Ærthegn]], a Tertius Grade household, had "around 100 Knight armours" which placed it "among the smaller Knight Households incorporated into the Imperium". It was later revealed that the true number was closer to 300, which rivalled some of the oldest Knight Households.{{Fn|20c}}  [[House Taranis]] was considered the strongest of the Knight Houses, with 600 Knights, and held the Grade of "Primus (Maximus)".{{Fn|21a}} [[House Coldshroud]], a Primus Grade household, possessed 389 knights at the outbreak of the Horus Heresy.{{Fn|21b}} [[House Terryn]], a Primus Grade household, was capable of field "almost 300 knights".{{Fn|21c}} [[House Procon Vi]], a Primus Grade household, was considered better categorized as two Secundus Grade houses. While possessing 447 knights, they were often fielded as two separate groups, with one of them containing roughly 215 knights.{{Fn|21d}} [[House Col'Khak]], a Secundus Grade household, boasted a strength of 254 knights, even after the losses at [[Isstvan V]].{{Fn|21e}} [[House Krast]], a Primus Grade household, possessed 400 knights at the outbreak of the Horus Heresy.{{Fn|21f}} [[House Moritain]], a Tertius Grade household, possessed 125 knights two decades before the Horus Heresy.{{Fn|21g}} [[House Zavora]], a Secundus (Maxis) Grade household, was known to be at the higher end of its Grade strength. It possessed 383 operational knights with an additional 100 in storage due to a lack of scions.{{Fn|21h}}