Lordran is the kingdom Gwyn founded, Anor Londo is his capital city. 

What kingdom does Dark Souls 1 take place in?

Nashandra is Vendrick's wife, and a shard of the abyss Manus. She's the reason his kingdom is in ruin.

In Dark Souls 2 who is King Vendrick's wife?

Oscar of Astora gives you the Estus Flask in the Undead Asylum before hollowing

Who gives you your Estus Flask in Dark Souls 1?

Prince Lothric was the first to refuse lighting the flame and set the game's events in motion.

Who was supposed to link the flame but refused to in Dark Souls 3?

Aldrich is devouring Gywndolin during the battle, however he uses a spell you get from killing Priscilla in Dark Souls 1

Who is the boss Aldrich devouring during his boss battle in Dark Souls 3?

Ornstein appears in Darksouls 1 and 2 as a boss. In Dark Souls 2 he has the same moveset as in Dark Souls 1 but with dark damage.

Which of these bosses shows up in two Dark Souls games?

Kaathe pops out and tries to convince you to bring the age of dark. He looks identical to Frampt.

If you defeat the four kings and place the lord vessel in the abyss, who greets you?

In Dark Souls one, only 3 of Gwyns kids are alluded to, however in Dark Souls 3 it is revealed Gwyn had another daughter.

How many children does Gwyn have?

Licia scams you to switch the hallway and will constantly invade you as the "Nameless Usurper" unless you kill her.

Which Dark Souls 2 NPC will invade you unless you kill her?

Siegward of Catarina refers to him as his old friend and helps you defeat him if you advance his quest. Siegmayer is the "onion knight" of Dark Souls 1.

Who is friends with the boss Yhorm the Giant in Dark Souls 3?

Sir Alonne from Dark Souls 2 will do it. He's a foreigner from a "land to the east" and helped the Old Iron King become King of his realm.

Which boss will commit seppuku if you beat them without being hit?

There are two, the Everlasting dragon in Ash Lake, and Kalameet in the Abyss DLC.

How many true dragons are in Dark Souls 1?

Havel and Seath were rivals, and Havel was eventually locked up by Gwyn.

Who is Havel's rival?

The Lost Sinner holds the Witch of Izaalith's lord soul.

In Dark Souls 2, which Lord Soul does The Lost Sinner drop in New Game Plus?

He is using a modified version of Gwyn's moveset, and it even plays a version of his theme.

In the Soul of Cinder's second phase, who's fighting style is he replicating? 

A test on your knowledge of the Dark Souls series!