Render Unto Caesar

 is a quest in Fallout: New Vegas.

Quick walkthrough
Travel to Cottonwood Cove and take the barge to the fort where you will talk to Caesar he will tell you to take the platinum chip and go into the weather station and destroy everything once done return to Caesar

Detailed walkthrough
Soon after you obtain the Platinum chip from Ring-A-Ding-Ding one of Caesar's followers will approach you in disguise and tell you that Caesar wishes to see you. There are a few dialog options here, but basically he will drop the conversation eventually and leave marking a location on the map where a boat waits to take you to Caesar.

** Edit** I have not yet attained the platinum chip, and the spy from Caesar's faction approached me. This occurred as soon as I killed Benny's bodyguards. Benny is somewhere at the fort. So the above may not be true, about needing to obtain the platinum chip. Also another note. It appears that if you have Boone for a companion, once you get to Cottonwood Cove, everyone is hostile. So you will have to leave Boone in a hotel room you have a key to.

Part 1: The platinum chip

Upon arriving at Caesar's fortress you will have all of your weapons removed(to be returned when you leave the fortress) with an option to keep your holdout weapons if you have any. if your speech skill is high enough then you can keep your medications instead saying that you suffer a heart problem. Make your way up the path and through the gate at the top, Caesar's tent will be directly ahead of you behind the circular arena. Enter the tent and speak with Caesar.

Caesar will tell you that there is a building in the back of the fort and it has machines with the same markings as the lucky 38 casino, and that there is a slot in the machine that seems like it would fit the platinum chip perfectly. He returns the chip and tells you that he wants everything in the building destroyed.

Exit the tent and make a right turn, following the turn around the tent until you see a campfire a little way away with a concrete building right next to it. Enter the building, and talk to the Legionary in front of you; he will return your weapons temporarily. There will be a machine on the wall directly in front of you; go up and put the chip in it, this will open the underground chamber. Enter the chamber and follow the path to the computer. Here you can talk to Mr. House and he will tell you what he wants you to do. You can listen, play it neutral, or defy him if you like, but when you are done continue to the stairs. At the bottom of the stairs is a hostile Protectron, a door and the rest of the path. Through the door are two hard locked computers, one unlocked computer, and some weapons. The computers control all the Protectrons, Automated_Turrets, and Sentry Bots respectively(the sentry bot one is currently worthless). you can decide to shut down all the defenses if you are able to hack the computers or continue on your way. the next door you pass is where the Sentry Bots are being held you can open the door with a 50 repair skill to disable the bots while they are harmless or pass it by. in the next room there are two Protectrons and a Turret if you turned the alert off then they will be harmless(out the windows on both sides you can see Mr. House's army), if not they will attack on sight. The next room holds four more Protectrons and 4 doorways, 3 leading to generators, and one leading to the computer station. If you would like to help Mr. House, Or yourself if planning on independence then go to the computer room, guarded by two more turrets, and start the upgrade on the console to your left. If you are following Caesar's orders examine one of the generator boxes. You will determine that by shooting the boxes you can cause an overload large enough to destroy everything, Shoot the first box, and the previously locked door will open and release four armed Sentry Bots into the hall. Finish off the other two boxes and massive explosions will rock the building. Now make your way out of there the turrets and Protectrons will still be harmless and you have two choices in dealing with the Sentry Bots(if you already haven't destroyed them). You can fight them or sprint past them and use the computer to deactivate them(I have always destroyed them so the computer is partially speculation). Leave the building once again losing your weapons with an option to keep the holdout ones, and make your way to Caesar to confirm the job is done. Now he has another job For you under the same quest.

Part 2: Mr. House

Caesar tells you that he wants Mr. House killed, as simple as that. Make your way back to the lucky 38 Casino, and notice that there are no Securitron to greet you outside the building. Since you destroyed the Building all Securitrons will be hostile towards you. Kill or pass the two on the first level and use the elevator to go to the penthouse. There are five Securitrons in the penthouse and they will all be hostile toward you(i have had one sometimes not be hostile, but rarely) in the same area with Mr. House's big screen there will be a computer tucked behind the stairs, use the computer to open the antechamber and there will be two more Securitrons waiting for you. On the wall in the antechamber next to a new door there will be another computer use this to access the elevator door next to it and take it down to the control room. use yet another computer to crack open Mr. houses medical pod ignoring the warning. Now talk to house and you are given three options after a few words you can kill Mr. house outright(for Caesar or yourself), you can just disconnect him from the mainframe(with the same results as killing him, just no bad feelings), or you can put him back in his pod and work for him again(never tested House annoyed me too much). If you kill him or disconnect him head back to Caesar and inform him and get another job in return.

Part 3: Boomers

Caesar wants you to get the boomers to use their artillery cannons against the NCR when he attacks Hoover Dam, The problem being that the use those cannons to bomb anyone that gets close to their base(if you already are idolized with them then skip to the end). Head to their base and a guy will stop you and offer information on how to get past the shells. You can use a speech check or pay him, but all it boils down to is to take a left turn as soon as you see the houses and follow the house line until you reach the end and make a beeline for the fence, once you are close enough to the fence(small suggestion: don't bring companions on Hardcore unless you don't like them, they tend to lag just enough that the near misses for you are direct hits for them). go to the gate and start, and finish the boomer quest line. after you have the Boomers support go back to Caesar and tell him they are with him.

part 4:

Behind the Scenes
The name of this mission is a reference to a Bible story in which, when shown a coin, Jesus Christ says to "render unto Caesar what is Caesar's and render unto the Lord what is the Lord's."

Bugs

 * If you don't specifically tell Boone to wait for you at the Luck 38 or his house, the dogs and guards will be hostile even if you can't see him following you.
 * Caesar's Legion may still be hostile towards the player, even when carrying the Mark of Caesar.
 * While wearing Legion armor if you get too close to them in the inner camp they may become hostile.(try a stealth boy to bypass this while sneaking).
 * The above mentioned bug doesn't happen if you go straight to Caesar after his spy approaches you. It only happened to me when I spoke to Mr. House first.
 * Some players may find that if you leave the Lucky 38 bunker to sleep or to collect ammo you will not be able to re-enter legitimately. The security guard states nobody can enter without Caesar's permission. As well as this Caesar also will not re-engage in dialogue with the player - therefore you do not gain permission (despite the fact you have already done so). The only known way to re-enter the bunker is to attack the guard at the door of the bunker. This will allow you to open the door - however doing this will turn the entire camp hostile towards you and they will all follow you into the room and Lucky 38 bunker. You will also not receive your weapons back for doing this and possible (haven't tried yet) be able to leave to return to the wasteland.