league – both teams have an influx of visiting fans in their home arenas when they play each other. However, neither team has won the cup since the 1990s when Montreal won the cup in 1993, and Toronto all the way back in 1967. Metropolitan Division The basic structure of the Metropolitan Division dates to the 1974 formation of the Patrick Division, which from 1981 onwards would have all its teams in the Mid-Atlantic States. It became the Atlantic Division (not the same as the current Atlantic Division) in 1993, and then the Metropolitan Division in 2013. The Metropolitan division boasts several of the NHL's longest and most storied rivalries. Battle of New York: New York Islanders vs. New York Rangers The Islanders–Rangers rivalry, also unofficially known as the "Battle of New York", is unique among New York City's major league sports, as the Islanders and Rangers are in the same conference and division, guaranteeing plenty of matchups – similar to the National Basketball Association's Brooklyn Nets and New York Knicks, who between 2015 and 2020 also shared arenas with the Islanders and Rangers, respectively. Major League Baseball's New York Yankees and New York Mets are in different leagues, as are the National Football League's New York Jets and New York Giants, so the only meeting opportunities are during inter-league or championship games. The games are often characterized by more fights in the stands than on the ice. The New York Islanders originally entered the league as the "step sister" of the New York Rangers, but their 4 straight Stanley Cups in the early 1980s generated a fierce rivalry between the teams and fan bases. Battle of Pennsylvania: Philadelphia Flyers vs. Pittsburgh Penguins The Battle of Pennsylvania, which is the Philadelphia Flyers–Pittsburgh Penguins rivalry, began in 1967 when the teams were introduced into the NHL's "Next Six" expansion wave. The rivalry exists due to divisional alignment and geographic location, as both teams play in the state of Pennsylvania. In their 2012 Eastern Conference Quarterfinals matchup, the rivalry strengthened with several on and off-ice incidents resulting in suspensions and fines. Philadelphia took a 3–0 series lead, and by the fourth game the two teams had combined to score an NHL-record 45 goals. The Flyers ultimately prevailed in game 6, by which point the two teams had combined for 309 penalty minutes. At times, the rivalry has been considered by some to