How mainy knights set at the round table?

Question

King Arthere called his knights to set at the round
table with swords laid in front of them.HOW MAINY?

Answer 1

If I remember correctly there was 12 but other knights would visit and be asked to sit. But Camelot & Arthur did not exsist. So the real answer would be none.

Answer 2

Wenchest round table history trace to 1270s, list 25 knights' names.
Every year, King Arthere called the knights together to Pentecost's Karmelor Castle. However, different stories record different sum of knights, from 12 to 150 or so. The earliest writer who described round table is Wace, his Roman de Brut is more detailed description to Historia Regum Britannian of Geoffrey of Monmouth. But even the earliest writers, including Geoffrey and Welsh Arthere Tale attribute the following superior knights to King Arthere:

Sir Aglovale，
Sir Agravaine，
Sir Bedivere (Bedwyr)
Sir Bors，
Sir Cador
Sir Caradoc，
Sir Colgrevance
Sir Constantine，
Sir Dagonet，
Sir Daniel
Sir Dinadan,
Sir Ector
Sir Ector de Maris，
Sir Elyan the White，
Sir Erec，
Sir Gaheris
Sir Galahad
Sir Gareth
Sir Gawain (Gawaine, Walganus, Balbhuaidh, Gwalchmai)
Sir Geraint
Sir Gingalain，
Sir Griflet
King Hoel
Sir Kay (Cai, Caius)
Sir Lamorak
(Launcelot du Lac)
King Leondegrance,
Sir Lionel
Sir Lucan
Sir Maleagant，
Sir Mordred,
Sir Palamedes the Saracen
Sir Pelleas
King Pellinore
Sir Percival (Perceval, Peredur)
Sir Safir，
Sir Segwarides，
Sir Tor
Sir Tristram
King Uriens
Sir Ywain (Owain),
Sir Ywain the Bastard，
Cai the Tall，Sir Kay。
Bedwyr, "Bedrydant", Sir Bedivere.
Gwalchmai，Sir Gawain。
Cador，
Kyndelig，
Gurhyr Gwalstat，
Meneu，
Caradoc，"Briefbras"