Question: The official that Æthelgeard served under was King of England between which years?
Context: Peter de Maulay or Peter de Mauley (died 1241) was a nobleman and administrator who was one of King John of England's "evil counsellors".  First appearing in the historical record in 1202, Maulay was in England by 1204 and serving as an official of John.  During the rebellions of the end of John's reign, Maulay supported the king and was given custody of the king's younger son as well as important prisoners.  Maulay continued to serve the new king after 1216 but ran into difficulties with the regents for the young King Henry III and was accused of treason in 1221.  Although cleared of the treason accusation, Maulay retired to his lands in late 1221.  In 1223 Maulay's lands at Upavon were confiscated by the king but were returned within a few months.  Upavon was again confiscated in 1229 and given to another noble, but in 1233 King Henry regranted the manor to Maulay, an event which led to a revolt by Richard Marshal, the Earl of Pembroke, against the king.  In 1241 Maulay went on crusade and died in late 1241, probably in the Holy Land while on crusade. Eadwig, also spelled Edwy (died 1 October 959), usually called the All-Fair, was King of England from 955 until his premature death in 959. Hugh de Cressy (died 1189) was an Anglo-Norman administrator and nobleman.  Little is known of his ancestry and he first served two brothers of King Henry II of England before becoming a royal official.  He was rewarded with a marriage to an heiress for his service to the king.  In England he often served as a royal justice and witnessed documents, which showed his closeness to the king.  On the continent, he recruited mercenaries for the royal army and was named constable of the castle of Rouen in the royal lands in France.  He died in 1189 after giving lands to various monasteries before his death. Maryland Day is a legal holiday in the U.S. state of Maryland.  It is observed on the anniversary of the March 25, 1634, landing of the first European settlers in the Province of Maryland, the third English colony to be settled in British North America.  On this day settlers from ""The Ark"" and the smaller ""The Dove"" first stepped foot onto Maryland soil, at St. Clement's Island in the Potomac River.  The settlers were about 150 in number, departed from Gravesend on the Thames River downstream from London.  Three Jesuit priests were collected from Cowes on the Isle of Wight in England where they avoided having to give the oath of allegiance and supremacy to the King.  The colony's grant was renewed to Cecil Calvert, 2nd Baron Baltimore, (1605-1675), two years prior by Charles I of England, after first being given to his father Sir George Calvert, 1st Baron Baltimore, (1574-1632), along with the title of "Lord Baltimore", and a first grant in Acadia, in Newfoundland, (modern Canada), (title named after lands and town Baltimore, in Ireland) who had served the King in many official and personal capacities as Secretary of State, 1619-1625 (despite his conversion to Roman Catholicism).  In thanksgiving for the safe landing, Jesuit Father Andrew White celebrated the Mass for the colonists led by the younger brother of Lord Baltimore, Leonard Calvert, (1606-1647), who served as the first governor, and perhaps for the first time ever in this part of the world on the first landing at Blackistone Island, later known as St. Clement's Island off the northern shore of the Potomac River, which was the new border between the new colony and the earlier English settlements in Virginia) and erected a large cross.  The landing coincided with the Feast of the Annunciation, a holy day honoring Mary, and the start of the new year in England's legal calendar (prior to 1752).  Maryland Day on 25 March celebrates the 1634 landing at St Clements.  Later the colonists and their two ships sailed further back down river to the southeast to settle a capital at St. Mary's City near the point where the Potomac flows into the Chesapeake Bay. Regenbald (sometimes known as Regenbald of Cirencester) was a priest and royal official in Anglo-Saxon England under King Edward the Confessor.  His name suggests that he was not a native Englishman, and perhaps was German or Norman.  He first appears in history as a witness to a royal document in 1050, and remained a royal chaplain and clerk throughout the rest of King Edward's reign.  Many royal documents give Regenbald the title of "chancellor" but whether this means that he acted in a manner similar to the later Lord Chancellor is unclear, as some of the documents may be forgeries or have been tampered with.  Whatever Regenbald's actual title, King Edward rewarded him with lands and also granted him the status, but not the actual office, of bishop.  Regenbald continued to serve the English kings after the Norman Conquest of England, although whether he served King Harold II of England is unclear.  His date of death is unknown, but it was probably during the reign of either King William I or William II.  After his death, some of his lands became part of the endowment of Cirencester Abbey in 1133. The conflict between the dynasties of the Capetians and Plantagenets covers a period of 100 years (1159-1259), during which the Kingdom of France fought against the Angevin Empire.  This conflict is also called by some historians, the "First Hundred Years War."  The conflict is primarily French, since both dynasties were French, the nobles that made up the English army were essentially of French origin, and the foot soldiers of the English king were local recruits in France (Anjou, Guyenne, Normandy, Brittany etc.).  At this period, the English king's continental possessions were considered more important than his island possessions, and significantly greater than even those of the French sovereign, even if the latter was the overlord of the former for most of the possessions he held on the continent.  And the official language of the two belligerents is the French of that time.  French also remained the official language of England until 1361.  Such is the origin of the expressions that can still be found today on the shields and coat of arms of the English monarchy "Honi soit qui mal y pense" and "Dieu et mon droit".  The English kings, who were of French origin, took wives from France from the 11th to the 15th century.  Very rare are those who married a woman of another country, including the cadet branches.  Hence the Plantagenet monarchs were ethnically French. Robert Burnell (sometimes spelled Robert Burnel; c. 1239 – 25 October 1292) was an English bishop who served as Lord Chancellor of England from 1274 to 1292.  A native of Shropshire, he served as a minor royal official before entering into the service of Prince Edward, the future King Edward I of England.  When Edward went on the Eighth Crusade in 1270, Burnell stayed in England to secure the prince's interests.  He served as regent after the death of King Henry III of England while Edward was still on crusade.  He was twice elected Archbishop of Canterbury, but his personal life—which included a long-term mistress who was rumoured to have borne him four sons—prevented his confirmation by the papacy.  In 1275 Burnell was elected Bishop of Bath and Wells, after Edward had appointed him Lord Chancellor in 1274. Mentuhotep was the non-royal father of the Ancient Egyptian king Sobekhotep III who ruled for about three years in the Thirteenth Dynasty, around 1750 BC.  Mentuhotep is mainly known from monuments of his son while he was king.  On these monuments appears also his wife Iuhetibu, who was called "king's mother".  On the monuments relating to Sobekhotep III, Mentuhotep bears the title "god's father".  The latter title is often given to non-royal fathers of kings.  Furthermore, from a high number of scarab seals there is known a military official with the title "commander of the ruler's crew".  This official had a son with the same title named Sobekhotep.  It seems possible that these scarabs belong to the "god's father" Mentuhotep before his son became king.  It is not known under which circumstances Sobekhotep III became king.  However, his father Mentuhotep had no known royal connections.  Two further sons are known, Seneb and Khakau.  They were bearing the title "king's son", albeit being evidently not the son of a king, but brothers of one. Æthelgeard, also Æthelheard (fl.  950s) was a 10th-century landowner who was known to have been involved in service to the royal family, likely an official of Eadwig. Ireland King of Arms was the title of an officer of arms to the King of England and Lord of Ireland from 1392 until the accession of Henry VII as King of England in 1485.  A king of arms is the highest of the three levels of officers of arms, and usually enjoys heraldic jurisdiction over a geographical area.  Despite the name Ireland King of Arms did not appear to exercise heraldic authority in Ireland, and indeed the connection with Ireland seems rather tenuous.  The office may have been created preparatory to a subsequently aborted military expedition to Ireland.  The last holder of the office, Walter Bellinger, did exercise the heraldic prerogative of a king of arms to grant armorial bearings, however two of his grants were annulled or regranted by other kings of arms as they felt he encroached on their provinces.  In 1552, 70 years after the last Ireland King of Arms, the office of Ulster King of Arms was created.  The holders of this office exercised control over the heraldic affairs of Ireland until the death of its last incumbent, Neville Wilkinson, in 1941.  Thereafter, heraldic affairs in Ireland were transferred to the Government of Ireland while the post was merged with that of Norroy King of Arms forming the present office of Norroy and Ulster King of Arms.
Answer: from 955 until his premature death in 959.