Answer by taking a quote from the following article:

Robert Walls (born 21 July 1950) is a former Australian rules footballer who represented Carlton and Fitzroy in the Victorian Football League (VFL) during the 1960s and 1970s. In a playing career that spanned three decades Robert played a combined 259 games and kicked a total of 444 goals. Throughout the 1980s and 1990s he continued to coach in the VFL/AFL for a total of 347 games across four different clubs. As a coach, his greatest achievement came in 1987 when he coached Carlton to the 1987 VFL premiership, the same club he won premierships with as player in 1968, 1970 and 1972.

After he retired as a player, Walls immediately took over as coach of Fitzroy. With a major clean-out of older players who were clearly "past it" in the club's disappointing 1980 season, Walls lifted the Lions to their best era since winning a premiership in 1944. Robert would coach Fitzroy Football Club for 115 games (60 wins - 54 losses - 1 draw).  They improved from last in 1980 to fifth at the end of the home-and-away season in 1981, securing their finals berth with an upset win over Collingwood and then beating Essendon in the Elimination Final before failing by the narrowest of margins in the First Semi against the Magpies. 1982 was relatively disappointing due to a poor start, but with players like Gary Pert and Paul Roos from the club's recruiting zones and South Australian recruit Matt Rendell growing into stars, the Lions were back as a force at the end of the season. 1983 saw the Lions emerge after five rounds as favourites for the premiership and maintain that favouritism with a sensational win in a top-of-the-table clash with North by 150 points with Rendell kicking eight goals besides destroying Gary Dempsey in the ruck. However, inevitable overconfidence saw the Lions lose form and finish fourth after losing two hard-fought finals.  1984, with injuries plaguing the club and its lack of depth apparent, was initially disappointing but a remarkable recovery saw them enter the five after the final round only to be crushed by Collingwood. In 1985, the Lions' financial crisis emerged to threaten their future and this, along with more injuries, caused them to drop to ninth with only seven wins and two losses to last-placed St Kilda. After this, Walls moved to his former club Carlton in a swap with David Parkin.

What league is Fitzroy part of?
Walls lifted the Lions to their best era since winning a premiership in 1944.