From Cults and Secret Orders of Our Age, by Gayr Martell, Baderborn, YE 989
Garendir kwa Erhendor / Who yields not wins
The arcane order of the Knights of Angermar (KoA) is first recorded by Stefen Doerdrach in his Cultus Obfuscatis in YE 311. He describes the order as "They are hid amidst the right Nobele Folke of the North & verily they seeke all the Might and Prosperitie they can howsoever attaine."
We also find the Knights in a Letter of Ban signed by the Cabal of Pure Thought's High Council of Magisters in YE 571, and in Livonian protocols of court from the last three decades of the sixth century of Enlightenment.
The order's rituals build on the worship of the old god Bolgen, a warlike and savage deity worshipped by the primitive tribes of the North in the Second Age (Deities & Demons, Dr. Hugarth Brox). In antiquity, worship of this god often demanded human sacrifice, and several accounts accuse the Knights of such horrid practices even in our enlightened Age.
The Arcane elements is believed to have been introduced to the order in the fifth century of Enlightenment, when the renegade magus Heyerman Exacrest Bannerburn became its Grand Master. Graf Wazenstam writes, "Bannerburn, after having fled from the Ordo Hermetica, quickly aquired infamy when he proclaimed himself Arch Magus of the Alemani. For a time, he terrorized the peasants east of Geistwald, until he was chased out by the Knights of St Invictus."
Apart from these sources, little except rumors have reached the Erian lands about this occult order. Still, I have myself spoken to a gentleman traveller (whom I will not name) who claimed to have spoken to a Livonian professing himself a Knight of the Axe of the Order of Angermar. Thus it can be assumed that the KoA has survived to this day, and that the order still maintains its lithurgies and guards its secrets, hidden amidst the nobility of Livonia.
The legend of Brōdar
Also, a cookie to the first who can tell me what the picture originally portrays.
[picture source: The Shackled City]