Bretwalda (also brytenwalda and bretenanwealda) is an Old English word, the first record of which comes from the late 9th century Anglo-Saxon Chronicle. It is given to some of the rulers of Anglo-Saxon kingdoms from the 5th century onwards who had achieved overlordship of some or all of the other Anglo-Saxon kingdoms. It is unclear whether the word dates back to the 5th century and was used by the kings themselves, or whether it is a later, 9th-century, invention. The term bretwalda also appears in a charter of ?thelstan.
The rulers of Mercia were generally the most powerful of the Anglo-Saxon kings from the mid-7th to the early 9th centuries, but are not accorded the title of bretwalda by the Chronicle, which is generally thought to be because of the anti-Mercian bias of the Chroniclers. The Annals of Wales continued to recognize the kings of Northumbria as 'Kings of the Saxons' (i.e. the English) until the death of Osred I of Northumbria in 716.
Bretw?lde was a term used in 11th and 12th century Ireland to denote the 'high king'. Part of the Gaelic lexicon, this spelling suggests a Germanic (Saxon) origin, as the 'w' is most likely pronounced as a 'v'. It is also possible that the term derives from the Welsh Brit Gweldig, the term for a ruler of Britain.Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, where the production of nickel-56 (which decays to iron) is the last nuclear fusion reaction that is exothermic. This allows radioactive nickel to become the last element to be produced before collapse of a supernova leads to events that scatters this precursor radionuclide of iron into space.
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