Kammala jumla mai zuwa: A lokacin kisan gillar Duke na Suffolk, Beaumont ya kasance abokin tarayya ne na Richard, Duke na York, wanda ya kasance daya daga cikin 'yan jarida na Duke a watan Mayu 1436 da Maris 1441, kuma watakila ma yana aiki a matsayin mai ba da shawara na Duke a wani lokaci. Ya kuma shiga York a majalisa na sarki a lokacin da aka fara kare shi na farko (Maris 1453 <unk> Janairu 1454). Amma kamar yadda York ya janye daga kotu, don haka Beaumont ya bayyana ya koma kusa da shi; ko da yake ya bayyana ba ya kasance a farkon yakin St Albans a 1455, ya riga ya tsaya tare da sarki a kan York a karshen ya tsaya tare da sarki a Dartford a 1452, sa'an nan kuma ya zauna a cikin hukunci a kan wasu daga cikin mutanensa. Daga bisani ya shiga ƙungiyar anti-Neville a kotu; ko da yake matarsa ta kasance Neville, iyalinta sun riga sun
sun hada kansu da Duke na York. Ya kasance daga cikin jam'iyyar sarakuna waɗanda suka ba da rahoto ga majalisa cewa sarki ba shi da lafiya kuma ba za su iya tayar da shi ba a watan Maris na 1454. Ya kuma kasance mai sulhu tsakanin York da jam'iyyar sarki, wanda Duke na Somerset ke jagoranta bayan murmurewar sarki a 1454; kodayake Griffiths ya ce ba'mai cikakken adalci' ba ne. Tabbas, Griffiths ya nuna cewa nadin sa a majalisar a ranar 15 ga Afrilu, 1454, bayan murmurewar sarki da korar York, wani bangare ne na kokarin da aka yi na'sake daidaita' majalisar bayan kariya. Har ma an bayar da rahoton (duk da cewa ba daidai ba) cewa yana tattara sojoji don su yi tafiya a kan London a 1454. Ya kasance daya daga cikin 'yan Lords Temporal da suka kasance a cikin majalisar Henry VI a cikin shekaru na ƙarshe na shekaru goma, a lokacin da ya kasance babban mai kula da sarauniya. Ya kuma kasance wani ɓangare na kwamitin sarauta da majalisar ta kafa a watan Yulin 1455 don bincika kashe kuɗin gidan sarauta; an nuna amincewar da Sarauniya ta ba shi a ranar 28 ga Janairu 1457 lokacin da aka nada shi a majalisar matashin Yariman Wales, wanda ke da alhakin gudanar da dukiyarsa, kashe kuɗi, ma'aikata, da gudanarwa.