Might & Magic dle release order:

JVC Univezum: 
1) Might and Magic Book One: The Secret of the Inner Sanctum
2) Might and Magic II: Gates to Another World
3) Might and Magic III: Isles of Terra
4) Might and Magic: World of Xeen
5) Heroes of Might and Magic: A Strategic Quest
6) Heroes of Might and Magic II: The Succession Wars
7) The Price of Loyalty (HOMAM 2 datadisk)
8) Might and Magic VI: The Mandate of Heaven
9) Heroes of Might and Magic III: The Restoration of Erathia
10) Might and Magic VII: For Blood and Honor
11) Armageddon's Blade (HOMAM 3 datadisk)
12) Might and Magic VIII: Day of the Destroyer
13) The Shadow of Death (HOMAM 3 datadisk)
14) Heroes Chronicles
15) Heroes of Might and Magic IV (+ datadisky The Gathering Storm a Winds of War)
16) Might and Magic IX: Writ of Fate

UBISOFT Univerzum: 
17) Heroes of Might and Magic V (+ datadisky Hammers of Fate a Tribes of the East)
18) Might & Magic Heroes VI (+ datadisky Pirates of the Savage Sea, Danse Macabre a Shades of Darkness)
19) Might & Magic X: Legacy
20) Might & Magic Heroes VII