state of Madhya Pradesh), the Nizam-ul-Mulk of Hyderabad survives an attempted ambush by Mughal Empire forces dispatched by the Sayyid brothers (Syed Abdullah Khan and Syed Husain Ali Khan Barha) and goes on to establish a rival state in southern India. June 25 – The "South Sea Bubble", the phenomenal growth of the South Sea Company, reaches its peak as South Sea stock is priced at £1,060 a share. By the end of September, as panic sales are made, the price falls to £150. July–September July 12 – Under the authority of the Bubble Act, the Lords Justices in Great Britain attempt to curb some of the excesses of the stock markets during the "South Sea Bubble". They dissolve a number of petitions for patents and charters, and abolish more than 80 joint-stock companies of dubious merit, but this has little effect on the creation of "Bubbles", ephemeral joint-stock companies created during the hysteria of the times. July 14 – (July 3 O.S.) The Treaty of Frederiksborg is signed between Denmark and Sweden, ending the Great Northern War. July 27 – The Battle of Grengam takes place in the Ledsund strait between the island communities of Föglö and Lemland. It is the last major naval battle in the Great Northern War taking place in the Åland Islands, marking the end of Russian and Swedish offensive naval operations in Baltic waters. August 14 – The Spanish Villasur expedition, which set out on June 16 from New Mexico, with the intention of checking French influence on the Great Plains of North America, ends in failure, as it is ambushed by a Pawnee and Otoe force. September 30 – "South Sea Bubble": The English stock market crashes, with dropping prices for stock in the South Sea Company. October–December October 8 – Sayyid Hussain Ali Khan Barha, one of the powerful Sayyid brothers of the Mughal Empire in India, is stabbed to death by Turkish nobleman Haider Beg Dughlat after Dughlat distracts him by giving him a petition to read. The assassination is ordered by Nizam ul-Mulk in retaliation for Sayyid Hussain's attempted ambush on June 19. October 15 – Muhammad Ibrahim, a grandson of the late Emperor Bahadur Shah I, is freed from prison by conspirators and declared the Mughal Emperor as a rival of his brother Muhammad Shah, beginning a 32-day reign that is described as being "like a drop of dew