Royal Timeline

Pre-King - Creation of Isolde (first Froslass) Creation of League of the Divine Blade, death of Amari
1st - King Richard - Creation of League, uniting of Kalos, origin of Draconis clan (10 centuries ago)
2nd - King Tristan - First war of Kalos, defeat of warlords (9 and a half)
3rd - Queen Celeste - Creation of Shadow Alliance from defeated warlords and disillusioned peasants, slaughter of the Psychics, birth, death and rising of Fabelle (8 and three quarters)
4th - Queen Abella - Integration of Draconis clan into Divine Leage, creation of Gawain in Sinnoh (7 and three quarters)
5th - King Bastien - ‘The Banette incident’, SA captures Fabelle and discovers how to banish her (7)
6th - Queen Marie - Rising of Amari, beginning of Grim Reaper urban legend (6 and a third) 
7th - King Absolon - Beginning of Kalos/Unova war, SA banishes Fabelle for a decade (5 and three quarters)
8th - Queen Charlotte - End of Kalos/Unova war, death of Absolon at the hands of Fabelle (5 and a half)
9th - King Nathanael - Attack on League of the Divine Blade by SA, SA’s almost complete destruction, Fabelle in Sinnoh (4 and three quarters)
10th - Queen Camille - Resurfacing of human Psychics, Divine Blade reformation, assassination of Emrys Draconis by Fabelle (4)
11th - King Arnauld - Kalosian revolution begins engineered by SA, Fabelle hunted down by Draconis clan and imprisoned for a short time then escape to Hoenn (3)
Regent - Chancellor Lavan - Revolution dies with Arnauld, kingdom’s rebuilding, Fabelle in Kanto (2 and three quarters)
12th - Queen Genevieve - Failed summoning of Giratina by SA, new age of prosperity begins for Kalos, Fabelle returns to Kalos (2)
Regent - Chancellor Edel - Kanto and Johto declare war on Unova (1 and a quarter)
13th - King Leopold - Unova and Kalos become allies against Kanto and Johto (Three quarters)
14th - King William - Birth of Merek, death of Merek’s father, Unova and Kalos win war, SA’s assassination of King William, Lady Laumeux’s short-lived capture of Fabelle (Half)
Regent - Chancellor Senlis - Fabelle begins the hunt for SA for tipping the balance (A year ago)
• CURRENT TIME —  
15th - King Kenitoh - SA’s final defeat, Fabelle’s redemption

This one's sort of out of date, Kenitoh.

This is what we have after discussing it:

(Times in brackets is when their reign began, some things happening very late into reign)
Pre-King - Creation of Isolde (first Froslass) Creation of League of the Divine Blade, death of Amari
1st - King Richard - Creation of League, uniting of Kalos, origin of Draconis clan (10 centuries ago)
2nd - King Tristan - First war of Kalos, defeat of warlords (9 and a half)
3rd - Queen Celeste - Creation of Shadow Alliance from defeated warlords and disillusioned peasants, slaughter of the Psychics at the hands of SA, birth, death and rising of Fabelle (8 and three quarters)
4th - Queen Abella - Integration of Draconis clan into Divine Leage, creation of Gawain in Sinnoh (7 and three quarters)
5th - King Bastien - ‘The Banette incident’, SA captures Fabelle and discovers how to banish her (7)
6th - Queen Marie - Rising of Amari, beginning of Grim Reaper urban legend (6 and a third) 
7th - King Absolon - Beginning of Kalos/Unova war, Unova begins it, SA banishes Fabelle for a decade (5 and three quarters)
8th - Queen Charlotte - End of Kalos/Unova war, death of Absolon at the hands of Fabelle (5 and a half)
9th - King Nathanael - Attack on League of the Divine Blade by SA, SA’s almost complete destruction, Fabelle in Sinnoh (4 and three quarters)
10th - Queen Camille - Resurfacing of human Psychics, Divine Blade reformation, assassination of Emrys Draconis by Fabelle (4)
11th - King Arnauld - Kalosian revolution begins engineered by SA, Fabelle hunted down by Draconis clan and imprisoned for a short time then escape to Hoenn (3)
Regent - Chancellor Lavan - Revolution dies with Arnauld, kingdom’s rebuilding, Fabelle in Kanto (2 and three quarters)
12th - Queen Genevieve - Failed summoning of Giratina by SA, new age of prosperity begins for Kalos, Fabelle returns to Kalos (2)
Regent - Chancellor Edel - Kanto and Johto declare war on Unova (1 and a quarter)
13th - King Leopold - Unova and Kalos become allies against Kanto and Johto (Three quarters)
14th - King William - Birth of Merek, death of Merek’s father, Unova and Kalos win war, SA’s assassination of King William, Lady Laumeux’s short-lived capture of Fabelle (Half)
Regent - Chancellor Senlis - Fabelle begins the hunt for SA for tipping the balance (A year ago)
—CURRENT TIME —  
15th - King Kenitoh - SA’s final defeat, Fabelle’s redemption