They have stated, too, that he fails to take advantage of his marriage to Melian, instead ignoring her advice about the Silmaril, leading to the downfall of his kingdom.

[T 3] Thingol meanwhile meets Melian the Maia, an angelic immortal, and falls in love with her; they create an enchantment which keeps his people from finding him.

Disapproving of their relationship, Thingol sets numerous quests that he thinks impossible for Beren, so as to prevent him from marrying Lúthien.

[T 10] In Tolkien's constructed languages, Thingol is Sindarin for "grey cloak", "greymantle", while the Quenya form of his name, Singollo, has the same meaning.

[4] Further, Flieger comments that the softening of "Singollo" to "Thingol" can also be taken as a diminishment, reflecting the "sound shifts that occur as light-infused Quenya modifies to twilight Sindarin".

[5] Robley Evans, writing in Mythlore, draws a parallel between Thingol and Fëanor: like him, he turns away from the Light, and chooses to remain in Middle-earth with Melian, who could stop time and its changes.

The Kingdoms are each penetrated by a mortal Man, in Doriath's case Beren; and the sense of Doom, which Shippey glosses as "future disaster", hangs heavy over all of them in the tale.

[7] The medievalist Marjorie Burns states that Thingol gains "great power" through his marriage to Melian, writing that she resembles Rider Haggard's infinitely desirable Arthurian muse, Ayesha of his 1887 novel She: A History of Adventure.

Rawls presents Thingol as a prideful king who rarely listens to his wife's counsel, even though she has immense foresight and wisdom; this helps to bring about the downfall of his kingdom.