First Ecumenical Council

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First, First aid, First to file and first to invent, First Beeline, First Minister and Deputy First Minister of Northern Ireland, First London, First Minister of Scotland, First West Yorkshire, First baseman, First Boston, FIRST Robotics Competition, First Student, First Worcester, First contact, First Act, First lady, First Love, Stoney Nakoda First Nation, First family, First aid kit, First Time, B2 First, First woman, First Fruits, First degree, First impression, First Light, First person, First Fleet, First American, First ladies of Pennsylvania, Credit Suisse First Boston, First Nations, First Line, Who's on First?, First man or woman, First ascent, First Union, FIRST Tech Challenge, First of May, Singaporeans First, First Horizon Bank, First ladies of Nevada, First-order logic, Kʼómoks First Nation, First Minister of Wales, The First Noel, First National Pictures, First-class cricket, First Things First (album), First Hampshire & Dorset, First Cut, First-person narrative, List of first ladies of Minnesota, Deputy First Minister of Scotland, First Glasgow, First Ministers' conference, Ɂakisq̓nuk First Nation, FIRST Lego League Challenge, First Step, First Things First, First Lady of the United States, First responder, First-rate, First Artists, First-order, First ladies and gentlemen of North Carolina, First Kiss, First Nehru ministry, First ladies and gentlemen of Alaska, First Nations in Ontario, First-person (video games), First Lady of Ethiopia, First South West, First and Last, First principle, First ladies and gentlemen of Guam, First Album, First 100 days of the first Trump presidency, First minister, First strike, First ladies of Wisconsin, First Merchants Corporation, First ladies and gentlemen of Arkansas, First Presidency (LDS Church), First American Financial Corporation, First grade, Be First, First Scotland East, First Republic of Korea, First Lady of Venezuela, First day of issue, First ladies and gentlemen of Oklahoma, First Chicago Bank, First-foot, First Dates, First ladies and gentlemen of the Philippines, First Bus East of England, First Growth, Dehcho First Nations, First Lord of the Admiralty, Breadth-first search, First Data, First-hitting-time model, First ladies and gentlemen of Mexico, Clovis First, First West of England, First-wave feminism, First Nations in Canada, For the First Time, First ladies of Maryland, First Blood, First Lady of the Gambia, First sergeant, The First 48, First Folio, FIRST Championship, First pass effect, First Expired, First Out, First ladies of Florida, First World problem, First Second Books, RSS First Step, First Hill, Seattle, First white child, Certified first responder, FirstGroup, Love at First Sight, Sipekne'katik First Nation, First Church, Wizard's First Rule, First Sea Lord, First Evil, Ceremonial first pitch, Maxillary first premolar, First Internet Bank, First Lady of Brazil, Sq'éwlets First Nation, First Things First (talk show), First ladies of North Dakota, First lieutenant, Mitaanjigamiing First Nation, First hand, First ladies and gentlemen of Montana, Nanoose First Nation, First-mover advantage, The First, First-person shooter, First period, First Aliyah, Sofia the First