Neither Edgar (959-975) nor his son Aethelred (978-1016) came to the throne free from controversy. Both of them succeeded their elder brothers, who reigned only briefly. King Eadwig (Edwy) succeeded his uncle in 955, while his brother Edgar was declared king in Mercia and the Danelaw. With the existence of two royal courts it seems likely that civil war was not far away when Eadwig died on this day - 1st October - in 959. He had issued so many charters that a degree of irresponsibility is probable, and he had quarrelled with Abbot, later Archbishop, Dunstan and driven him into exile.
Aethelred was Edgar’s younger son, and succeeded his (step) brother Edward when he was murdered at Corfe. Throughout his reign he was never entirely able to escape from the fact that the murder had been committed for his sake.
This then was the political situation over which Edgar and Aethelred had to govern.
The king normally stayed in the south, and his presence in the north was made to be felt by his appointed ealdormen. Within the royal court there was a strict hierarchy, evidence of which comes from a scrutiny of the witness lists of Aethelred’s reign, where athelings, ealdormen, thegns and bishops subscribed in strict order of seniority. This order normally changed only when one subscriber died, but the witness lists of Aethelred’s reign show how powerful particular ealdormen could become. Eadric Streona headed the lists from 1009x12 to 1016, in the lifetime of other ealdormen who had once been his seniors. The king had no choice but to rely on these men for their cooperation and support, which was to some extent ensured by their attendance at the royal council, the Witan, where laws were deliberated upon and promulgated.
In contrast, the early years of Aethelred’s reign show him undoing much of Edgar’s work, with lands being taken away from religious foundations, such as Abingdon, Rochester and Winchester. Until 993 it seems that Aethelred was being led astray by ealdormen who took advantage of his youth and ignorance. Fortunately for the church, these lands were restored after 993, when, with different ealdormen emerging, Aethelred was seen to mend his ways with the restoration of the privileges of Abingdon.
A charter from Aethelred's reign
Edgar’s reforms set the standard and the system was continued under Aethelred. During his reign there were more than 60 mints in operation. Of course, there was a great increase in the output of the mints at this time because of the payment of the Danegeld, something with which Edgar was not confronted. It was probably at the instigation of Archbishop Sigeric after Byrhtnoth of Essex was killed at Maldon (991), that the decision was taken to pay the Danes in the hope that they would go away.
“In this year it was decided to pay tribute to the Danes … on this occasion it amounted to £10,000. This course was adopted on the advice of Archbishop Sigeric.” 
The payment of the Danegeld indicates two things: the amount of fluid wealth in England and the capacity of the English to tap it.
Another form of taxation (albeit strictly a military tax) was the Ship Soke. Most of the evidence we have for this comes from the reign of Aethelred. The much quoted entry for 1008 in the Anglo-Saxon Chronicle tells us that
“In this year the king gave orders that ships should be speedily built throughout the whole England: namely one large warship was to be provided from every 300 hides, and a a cutter from every ten hides, while every eight hides were to provide a helmet and a corselet.”
Aethelred was reacting sensibly to the Danish threat, but there is evidence to suggest that this was no innovation. FE Harmer (Anglo-Saxon Writs) pointed out that in 1003/4 Archbishop Aelfric made a bequest of ships and HPR Finberg  credited Edgar with the invention. He cited the Triple Hundred of Oswaldslow created by Edgar, and said that Edgar organised efficient naval patrols around the shores of Britain.
The origin of the Hundred is somewhat hazy. Most of what we know about this administrative unit is derived from a document known as the Hundred Ordinance. Dated somewhere between 939 and 960, the Ordinance is the subject of controversy among historians who are unable to agree upon its author. But the Ordinance was definitely in existence by Edgar’s reign. It decrees that the hundred court should meet every four weeks, and that each man should do justice to other men there. II&III Edgar reinforces the Ordinance, by stating that the borough court is to be held thrice a year and the shire court twice, and the hundred court is to be attended as was ‘previously established.’
My very battered student copy of the translation of the Hundred Ordinance
Edgar’s dealings with the Danelaw can be found in IV Edgar, the Wihbordesstan Code. It had often been said that Edgar was creating something new with this code. But technically speaking this is a letter to the Danes, showing Edgar eager to respect an autonomy which was already a fact.
It is probable that Edgar became king of England in 959 with the help of a powerful group of magnates who wanted a king who would not encroach on the customary law. Niels Lund  says that the whole point of the letter is to notify the Danelaw that he wishes a new law to apply to all his kingdom, that he knows that this is a violation of their privileges but nevertheless he asks them to accept it. Edgar stresses five times that he has every intention of respecting the Danelaw. It is possible that although IV Edgar is a recognition of established fact, Edgar himself created the Danelaw, as there are no earlier references to it. In all probability these privileges were granted by Edgar in 957, in gratitude for the support given him in the north against his brother Eadwig.
King Eadwig, who died 1st October, 959
In the Wihtbordesstan code, sanctions against lawbreakers are left to be decided by the Danes, while Edgar and his councillors provide the rules for the rest of England. “And it is my will that secular rights be in force among the Danes according to as good laws as they can best decide upon. Among the English, however, that is to be in force which I and my councillors have added to the decrees of my ancestors.”
A comparison of Aethelred’s Wantage and Woodstock codes, shows that Aethelred on the other hand, attempted to impose English law on the Danelaw. Known respectively as III and I Aethelred, these codes were issued at more or less the same time, Wantage being specifically for the Danelaw.
I Aethelred says, “If, however he (the accused) is of bad reputation, he shall go to the triple ordeal.”
III Aethelred says, “And each man frequently accused is to go to the triple ordeal and pay four-fold.”
Not only did Aethelred set out the sanctions he imposed in the Danelaw, but he took a portion of the fines as well. Fines in the Danelaw were heavier than elsewhere in the country. It has been said that these measures show how much Aethelred was firmly in control of the Danelaw. Lund argues that rather it shows how Aethelred was attempting to gain firm control. He had no reason to think that he could rely on the north for support. On the contrary, he feared treachery, which led to his securing hostages from Northumbria in 991, and to the notorious massacre of St Brice’s day in 1002. His relations with the Danes are highlighted by the readiness with which the north accepted the Danish conquerors. The murdered Sigeferth and Morcar belonged to a northern family so powerful that Aethelred’s son Edmund Ironside’s marriage to Sigeferth’s widow gained him enough power to become the accepted king of the Five Boroughs.  It was people like these whom Aethelred, in total contrast to Edgar, managed to alienate by his attempts to impose English law on them.
 EHD (English Historical Documents) 1 113
 II&III Edgar 59-963 EHD 1 40
 The Anglo-Saxon Chronicle (E) 991
 The Formation of England 550-1042
 King Edgar and the Danelaw, Med. Scand. 9
 The five main towns of the Danelaw: Derby, Leicester, Lincoln, Nottingham, Derby
* Triple hundred - an area of land, three times the administrative unit of the hundred
(All above images are in the public domain)