The four knights (rileys)

Question

Four knights were on four hills, some on higher hills than others.

The first spoke, and he said:
“I begin with my “for” noun,
then the one next to me is tumblin’ down,
then I… um… ummmm… yeah that’s all I remember.”
He had a sign with the hashtag “#MeToo” on it.

The second one spoke,
“My start is new, to the Romans,
the next is a very, very long time to say,
and my finish makes sure you shalt see!
Oh, and so do I.”
He was carrying a sign saying: “Subscribe to TopTens!”

Then the third, oft mistaken for land, arrived. He said:
“My first is a [[HYPERLINK BLOCKED]]
My middle is really [[STINKING]] good.
My finale is the same as the second [[HYPERLINK BLOCKED]]
And together, I am confused with those LITTLE FRENCH LAND-“
He storms out with his new driver’s license, and hops on his horse, named “Lambourginie”.

Then, you’re prepared to walk to the king’s chamber and tell him the knight’s names when…

“hey. it’s me…
i suppose i should have a riddle…
well, i’m oft overlooked, and confused with an übermensch’s death,
my start is what this is, minus “ick”…
my end is the last two’s.
enjoy, i guess.”

Undeterred, you walk into the king’s room and tells him the name of the knights. He tells you his name in return.

Sounded Russian.

What are the four knights' names?

Optional: What's the king's name?

SMØL HINT, BY IKEA:

Those little French lands have a lot of dead bodies. R.I.P.

MÆDIUM HINT, BY IKEA:

They sit at a NON round table, and its bench is unstable.

Answer 1

I think the four knights are

Helium, Neon, Argon and Krypton (the first four noble gases)

The king is probably

Dmitri Mendeleev, who created the periodic table of elements

The first spoke, and he said:
“I begin with my “for” noun,

My guess here is that "for" noun is a cryptic way of describing a pronoun which in this case is He.

then the one next to me is tumblin’ down

Not totally sure about this part but I think it refers to the fact that the next element in the periodic table is Lithium (Li) which is the next part of the word Helium.

then I… um… ummmm… yeah that’s all I remember.”

The last part of Helium is um

He had a sign with the hashtag “#MeToo” on it.

MeToo sounds like "me two" referring to the fact that Helium is the second element of the periodic table.

The second one spoke,
“My start is new, to the Romans,

I think this refers to Neo, (although this actually has Greek etymology rather than Latin so I might be wrong about this (yes, OP can confirm, I messed these up))

the next is a very, very long time to say,

Eon

and my finish makes sure you shalt see!

I think this refers to on (as in something being turned on, such as a light switch).

Oh, and so do I.”

Neon is often used in signs and produces a reddish-orange light.

He was carrying a sign saying: “Subscribe to TopTens!”

Neon has atomic number 10.

Then the third, oft mistaken for land, arrived. He said:
“My first is a [[HYPERLINK BLOCKED]]

Here just saying that the first letter is a

My middle is really [[STINKING]] good.

rg is an acronym for really good

My finale is the same as the second [[HYPERLINK BLOCKED]]

Argon has the same ending as Neon

And together, I am confused with those LITTLE FRENCH LAND-“

I think this refers to Argonne (Yes, it does, according to OP)

He storms out with his new driver’s license, and hops on his horse, named “Lambourginie”.

Not sure about this bit other than the middle part of the word sounds a bit like argon

“hey. it’s me…
i suppose i should have a riddle…
well, i’m oft overlooked, and confused with an übermensch’s death,

The übermensch is Superman whose weakness is kryptonite, often confused with Krypton, and “oft overlooked” refers to its status as a not very noticeable element.

my start is what this is, minus “ick”…

Kryptick sounds like cryptic

my end is the last two’s.

Krypton has the same ending as Neon and Argon.

OP SMALL INCLUSION:

The four knights refers to them being noble gases. rimshot