Which English Club was the first to win three successive league titles? I'll give you a clue - it is not Manchester United, Liverpool or Arsenal. It is, in fact, the club now managed by a German maverick who are playing their first top-flight season in thirty-five years!
#1 Huddersfield Town

Huddersfield Town AFC are now considered to be punching above their weight and the club is one of the 'smallest' in the Premier League in terms of it's infrastructure and budget. But, in terms of history, Huddersfield had been very successful much before David Wagner and long before Arsenal had won their first league title and Chelsea had even won their first trophy!
Between 1923-24 and 1926-27 under Herbert Chapman and Cecil Potter, Huddersfield Town AFC won three first division titles consecutively, along with an FA Cup in 1922.
The Yorkshire club have not won a single trophy since that glorious period. They did, however, steadily perform in the league and cup but did not win any of the trophies that they competed in.
The Second World War broke their progress and when the league resumed, the club failed to recreate their success and eventually dropped down divisions and came back up to the top flight only to go down again in the 1960s.
They won the second division in 1970 and spent the two following seasons in the top-flight and have since been on a terminal decline, in terms of becoming relevant to the trophy chasers again until last season - when David Wagner sparked a resurgence of the club.
Huddersfield Town have started their Premier League season positively, and there's plenty of time left before this season ends, but so far, the future looks bright again.