Macron has been the first president of the Fifth Republic  to beat the "incumbent curse" and win a second term while having a majority at the parliament. At least, since 1965, when Charles de Gaulle won re-election facing one François Mitterrand.

Technically, 1965 was the first election of the president by direct suffrage: for his first term in 1958, De Gaulle was elected by an electoral college of lawmakers and mayors. The direct suffrage was introduced by referendum in 1962.

Mitterrand and Chirac both won a second term, in 1986 and 2002, respectively, but they had lost their parliamentary majority two years prior, and the government was then run by their main opponent whom they had to appoint as Prime Minister: Chirac, PM of president Mitterrand from 1986 to 1988, and Jospin (PS), PM of president Chirac from 1997 to 2002.

Now, Macron's challenge will be to keep a parliamentary majority in the upcoming Legislative elections, 12 and 19 June. As eurogreen commented above, Left wing parties are talking about presenting a united front, hoping to get a majority of seats. Mélenchon, who is a shrewd and intelligent politician, has already started this campaign: a few days ago, in a newspaper interview, he called for the French people to "elect him Prime Minister" in June.