- "Ser Preston will be stationed here beside the... primary entertainment."
- ―Ser Jaime Lannister
When Arya Stark was brought before King Robert Baratheon to answer for her possible involvement in the injury of Prince Joffrey, Ser Preston stands guard besides the King.
After Jaime Lannister returns to King's Landing, he goes over with Ser Meryn Trant the placement of the Kingsguard members in defensive positions during Joffrey's wedding, assigning Ser Preston a place close to the wedding feast "primary entertainment".
|Season One appearances|
|Winter Is Coming||The Kingsroad||Lord Snow||Cripples, Bastards, and Broken Things||The Wolf and the Lion|
|A Golden Crown||You Win or You Die||The Pointy End||Baelor||Fire and Blood|
|Season Three appearances|
|Valar Dohaeris||Dark Wings, Dark Words||Walk of Punishment||And Now His Watch Is Ended||Kissed by Fire|
|The Climb||The Bear and the Maiden Fair||Second Sons||The Rains of Castamere||Mhysa|
|Season Five appearances|
|The Wars To Come||The House of Black and White||High Sparrow||Sons of the Harpy||Kill the Boy|
|Unbowed, Unbent, Unbroken||The Gift||Hardhome||The Dance of Dragons||Mother’s Mercy|
In the books
In the A Song of Ice and Fire novels, Greenfield is a member of Robert Baratheon's Kingsguard. He is noted as the shortest member of the Kingsguard. He accompanied Robert on his boar hunting trip where he was mortally wounded. He pledges allegiance to Joffrey following Robert's death.
Ser Preston is killed in the Riot of King's Landing and replaced by Ser Balon Swann, who has been mentioned in the series but not as part of the Kingsguard. In the series no Kingsguard is shown to be killed by the rioters. Ser Preston is later mentioned as being alive at the time of Joffrey's wedding, meaning he survived the riots in TV continuity.
|Lord:||None, extinct||Heir:||None, extinct|
|Seat:||Red Keep, King's Landing||Lands:||The Crownlands|
|Title(s):||King of the Andals and the First Men · Lord of the Seven Kingdoms · Protector of the Realm|
|Current members:||Cersei Lannister|
|Deceased members:||Robert I · Joffrey I · Myrcella Baratheon · Tommen I · Margaery Tyrell|
|Household:||Jaime Lannister · Gregor Clegane · Preston Greenfield · Arys Oakheart · Boros Blount · Balon Swann · Osmund Kettleblack · Ilyn Payne · Gyles Rosby · Aron Santagar · Qyburn · Eglantine|