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Among the four major North American sports leagues, the NBA has traditionally stood out in the popular imagination as being the league of the dynasties. The Boston Celtics of the 1960s begat the Celtics and Los Angeles Lakers of the 1980s begat the Chicago Bulls of the 1990s, and so on and so forth.

For this reason, it may surprise you to learn that in the NBA Finals' entire history—from its quaint 1947 origins to the present day—professional basketball's final series has seen just nine sweeps.

Here is a look back at the nine perfect performances in the event's annals. Note before we begin that there were four best-of-five finals sweeps in the history of the National Basketball League, the NBA's immediate predecessor.

The very first Finals between Boston and the Lakers, and the only one that took place while the Lakers were located in Minneapolis. The first of the Celtics' run of eight straight championships, the longest streak in the history of the four major North American sports. Boston center Bill Russell averaged 29.5 rebounds per game, which will play.

The Milwaukee Bucks' first title, and their only title until 2021. The first of six rings for Bucks center Lew Alcindor, the future Kareem Abdul-Jabbar. The most recent of two series, along with the 1956 Finals, played under a 1-1-1-1-1-1-1 format in which the two teams alternated home games.

Both the Golden State Warriors (Al Attles) and Washington Bullets (K.C. Jones) had Black head coaches, which hadn't happened before in any league. The Bullets actually took three of four from Golden State in the regular season, anticipating a highly competitive matchup. A 14-5 run late in Game 4 gave the Warriors their last title until 2015.

A fitting conclusion to Hall of Fame center Moses Malone's third and final MVP season. Polished off a 12-1 playoff run after Malone predicted the Philadelphia 76ers would need only four games to win each series. The last major Philadelphia championship until the Philadelphia Phillies won the World Series in 2008.

The Detroit Pistons' first title after a grueling seven-game loss to the Lakers the season prior. Featured a superb performance from Pistons guard Joe Dumars, who averaged 27.3 points per game. The curtain call on Abdul-Jabbar's spectacular 20-year career.

Notorious for the Orlando Magic's complete meltdown in Game 1, during which guard Nick Anderson missed four crucial free throws to open the door for Houston Rockets guard Kenny Smith's game-tying three. The Rockets, seeded sixth, became the lowest-seeded team to win the title. Houston's title followed a seven-game championship win over the New York Knicks in 1994.

The Lakers' third consecutive championship, and center Shaquille O'Neal's third consecutive Finals MVP award. Los Angeles overcame a superb individual series from New Jersey Nets guard Jason Kidd, who had averaged a triple-double in the Eastern Conference finals. The last Finals aired on NBC to date.

Noted for its astoundingly low scores, Game 3 was the lowest-scoring Finals game since 1955. The first Finals for Cleveland Cavaliers forward LeBron James, and for every Cavalier apart from veteran guard Eric Snow. Despite several close games, only in Game 4 did Cleveland lead in the second half.

The sweep everyone remembers. Began with a bizarre overtime game in which Cavaliers guard J.R. Smith appeared to forget the score at the end of regulation and James scored 51 points in defeat. The average margin of victory, 15, is the largest in any NBA Finals.