Question: Herman I, Duke of Swabia, was the cousin of the first non-Carolingian king of East Francia, who was called what?

Context paragraphs:
Argengau: Argengau was a territory of Alemannia within East Francia in the 8th and 9th centuries, being a county in the 9th century, and of the Duchy of Swabia in the 10th.  It was situated north of Lake Constance, comprising Lindau.

Henry the Fowler: Henry the Fowler (German: "Heinrich der Finkler" or "Heinrich der Vogler "; Latin: "Henricus Auceps" ) (876 – 2 July 936) was the duke of Saxony from 912 and the elected king of East Francia (Germany) from 919 until his death in 936.  As the first non-Frankish king, he established the Ottonian Dynasty of kings and emperors, he is generally considered to be the founder and first king of the medieval German state, known until then as East Francia.  An avid hunter, he obtained the epithet "the Fowler" because he was allegedly fixing his birding nets when messengers arrived to inform him that he was to be king.  By his death in July 936 Henry had prevented collapse of royal power, as had happened in West Francia, and left a much stronger kingdom to his successor Otto I.  Henry died on 2 July 936 in his royal palace in Memleben, one of his favourite places.  He was buried at Quedlinburg Abbey, established by his wife Matilda in his honor.

Battle of Püchen: The Battle of Püchen was fought in the summer of 919, between a Hungarian raiding army and the newly elected East Francian/German king Henry the Fowler, and ended with a Hungarian victory.  This battle was a part of a long range Magyar raiding campaign, which lasted between the summer of 919 and the late winter or early spring of 920, and took part in countries like East Francia, West Francia, Burgundy and the Kingdom of Italy, resulting in victorious battles against the German king Henry the Fowler and the Burgundian king Rudolf II, while the West Francian and Lotharingian king Charles the Simple had no courage to face them.

Middle Francia: Middle Francia (Latin: "Francia media" ) was a short-lived Frankish kingdom which was created in 843 by the Treaty of Verdun after an intermittent civil war between the grandsons of Charlemagne resulted in division of the united empire.  Middle Francia was allocated to emperor Lothair I, the eldest son and successor of emperor Louis the Pious.  His realm contained the imperial cities of Aachen, the residence of Charlemagne, as well as Pavia but lacked any geographic or ethnic cohesion which prevented it from surviving and forming a nucleus of a larger state, as was the case with West Francia and East Francia.

Herman I, Duke of Swabia: Herman I (died 10 December 949) was the first Conradine Duke of Swabia (from 926), the son of Gebhard, Duke of Lorraine, and a cousin of King Conrad I of Germany.

Duchy of Saxony: The Duchy of Saxony (Low German: "Hartogdom Sassen" , German: "Herzogtum Sachsen" ) was originally the area settled by the Saxons in the late Early Middle Ages, when they were subdued by Charlemagne during the Saxon Wars from 772 and incorporated into the Carolingian Empire (Francia) by 804.  Upon the 843 Treaty of Verdun, Saxony was one of the five German stem duchies of East Francia; Duke Henry the Fowler was elected German king in 919.

Conrad I of Germany: Conrad I (German: "Konrad" ; c. 881 – December 23, 918), called the Younger, was the first non-Carolingian king of East Francia from 911 to 918.  He was the first elected king of East Francia and also the first one to be anointed.  He was chosen as the king by the rulers of the East Frankish stem duchies after the death of young king Louis the Child.  Prior to this election he had ruled the Duchy of Franconia from 906.

Rodulf Haraldsson: Rodulf Haraldsson (died June 873), sometimes Rudolf, from Old Norse Hróðulfr, was a Viking leader who raided the British Isles, West Francia, Frisia, and Lotharingia in the 860s and 870s.  He was a son of Harald the Younger and thus a nephew of Rorik of Dorestad, and a relative of both Harald Klak and Godfrid Haraldsson, but he was "the black sheep of the family".  He was baptised, but under what circumstances is unknown.  His career is obscure, but similar accounts are found in the three major series of "Reichsannalen" from the period: the "Annales Bertiniani" from West Francia, the "Annales Fuldenses" from East Francia, and the "Annales Xantenses" from Middle Francia.  He died in an unsuccessful attempt to impose a danegeld on the locals of the Ostergo.

Fulk (archbishop of Reims): Fulk the Venerable (died June 17, 900) was the Archbishop of Reims from 882 until his death.  He was the chief opponent of the non-Carolingian king of France, Odo, in the last quarter of the 9th century.  He was the brother of Anscar I, Margrave of Ivrea

Radbod (prefect): Radbod ( 833–54) was the East Frankish prefect of the Eastern March ("marcha orientalis"), the Bavarian frontier towards the Slavs, appointed in 833.  He had been appointed the office after Louis the German's conquest in 828, and subsequent Christianization of the Moravians (828–33).  In 833, according to the "Conversio Bagoariorum et Carantanorum", a Slavic prince, Pribina, had been "driven across the Danube by Mojmir, duke of the Moravians", and fled to Radbod in East Francia around 833.  Radbod introduced him to King Louis the German, who ordered that Pribina should be "instructed in the faith and baptized", and that he serve with his followers in Radbod's army.  Before long, however, Radbod and Pribina fell out, and the latter, fearing for his life, fled with his son Koceľ to the First Bulgarian Empire, and then to Lower Pannonia ruled by a Slavic duke, Ratimir.  Since Lower Pannonia was part of Radbod's prefecture, Ratimir's harboring of Pribina was tantamount to rebellion, therefore, in 838, Louis the German sent Radbod at the head of a large Bavarian army to crush Ratimir, but Pribina and his followers took refuge with the count of Carniola, Salacho.  In short time the latter brokered a reconciliation between Radbod and Pribina, and Louis solved the ongoing instability by appointing Pribina as his faithful "dux" with lands in around the Zala river.  Radbod held contacts with Rastislav (r. 847–70), ruler of the Moravians (successor to Mojmir), who had long posed a danger to Bavaria.  According to the "Annals of St-Bertin", in 853 Charles the Bald, king of West Francia, bribed the Bulgarians to ally with the Slavs (apparently the Moravians) and together attack Louis the German's kingdom.  In the course of the Bulgarian–Moravian attack, Louis the German deposed Radbod in 854 for infidelity, after an uprising.  Radbod then formed a rebel alliance with Rastislav.  In 855, Rastislav (Rastiz) rebelled, and Carloman was made prefect in Radbod's place in 856.  Carloman's 858 campaign forced Rastislav to make peace.

Supporting paragraphs: Herman I, Duke of Swabia Conrad I of Germany
Answer: the Younger