Which football team won a La Liga trophy in the season that started on 29 August 1998 and finished on 20 June 1999?
1998–99 La Liga The 1998–99 La Liga season, the 68th since its establishment, started on 29 August 1998 and finished on 20 June 1999.
1988–89 La Liga The 1988–89 La Liga season, the 58th since its establishment, started on September 3, 1988, and finished on June 25, 1989.