after the death of his father in 1428 he took over the government together with his younger brothers william iii, henry and sigismund. in 1433 the wettins finally concluded peace with the hussites and in 1438 frederick led saxon forces to victory in the battle of sellnitz. that same year it was considered the first federal state parliament of saxony. the parliament received the right to find together in case of innovations in fiscal matters also without summoning by the ruler.