Morrowind:Pledge from Canctunian Ponius

Quick Walkthrough
# Talk to Iulus Truptor at the Imperial Chapels in Ebonheart for a new almoner mission.
# Go to the East Empire Company and talk to Canctunian Ponius to retrieve a pledged donation.
# Canctunian Ponius will instead ask you to track down 3,000 gold of money embezzled from by a clerk, Mossanon.
# Talk to Shazgob gra-Luzgan to learn that the clerk had been seen using the Guild Guide in the Foreign Quarter.
# Speak with Flacassia Fauseius in Vivec.
# Ask around the Sadrith Mora Mages Guild about Mossanon.
# Talk to any Dark Elf females in Sadrith Mora about Mossanon and find out that he is seeing Volmyni Dral.
# Find Mossanon in Dral's house and persuade him to return the money.
# Come back to Canctunian Ponius with the money to receive his pledge.
# Return to Iulus Truptor to complete the quest.

Detailed Walkthrough
Almoner Mission
Iulus Truptor at the Imperial Chapels in Ebonheart will ask you to collect another promised pledge of 1,000 gold from Canctunian Ponius of the East Empire Company (in his office at the company hall).

Pledge from Canctunian Ponius
When you ask Canctunian Ponius about his pledge, he'll instead ask you to track down 3,000 gold of money embezzled from the treasury by the clerk Mossanon. Once you recover this money, Canctunian Ponius says he'll pay his pledge.

Start right off by asking around the hall about Mossanon and you'll soon talk to Shazgob gra-Luzgan, who will tell you that the clerk had been seen using the Mages Guild Guild Guide in the Vivec guild hall. Okan-Shei in the hall will further tell you that this is because Mossanon has a Telvanni girlfriend.

In Search of the Clerk
Travel to the Mages Guild in Vivec and speak with Flacassia Fauseius, who will tell you that Mossanon has traveled frequently to Sadrith Mora, as should you. Many members of the guild there will direct you to a High Elf trader named Sinyaramen at the Gateway Inn in town. Sinyaramen cannot help you but suggests you talk to Dark Elf females if you want info on a Telvanni with a High Elf boyfriend. Confused yet? Alternatively, you can speak to the Sadrith Mora guild guide, Iniel, who will direct you to Volmyni Dral.

If you talk to Iniel or any Dark Elf females in Sadrith Mora about Mossanon, they should report having seen a High Elf in the company of Volmyni Dral, who lives near Wolverine Hall in town. Find and enter Dral's house; you'll find Mossanon upstairs. He explains that he did it to impress his girl, but now he knows she doesn't care whether he is rich. If your Speechcraft skill is high enough and his disposition towards you is favorable, he'll trust you and offer to return it on the condition that you don't reveal where he is. At this point you have three options:

Promise secrecy: he'll give you 2,500 of it (he spent the rest) and thank you for your help.
Demand the gold: if his disposition is high enough, he'll hand it over and beg for mercy.
Consider his offer: he'll say goodbye. Nothing will happen other than a journal update, when you talk to him again you'll still have the same three options.

Return the Money
If you want to keep the gold, simply return to Iulus Truptor. To do the right thing, return to Canctunian Ponius in the East Empire Company Hall in Ebonheart with the news. You have the option of returning all or only a part of the money, since he has no way of knowing how much you actually recovered. If you got Mossanon's disposition up to have him hand over the money without making any promises then you have the option to tell Canctunian that you found the thief. You can reveal his location or not as you choose. If you do wish to tattle, or just let Canctunian know that you found Mossanon, be sure to talk to him about Mossanon before Embezzled Funds. Once the money is handed over, Canctunian Ponius considers the Mossanon matter closed.

Return to Iulus Truptor with the money to receive the Zenithar Whispers, an amulet that casts charm. This is the last almoner mission he has for you. If your rank is high enough he'll say he's given your name to the Oracle, and that you should consider taking some quests from her directly.

Notes
You can choose to bypass most of the quest by paying Canctunian Ponius out of your own pocket. However, finding Mossanon is far more interesting.
It is possible to get the 2,500 twice by first pickpocketing it from Mossanon and then talking to him about the embezzled funds.
If you get the embezzled funds from Mossanon and return straight to Iulus Truptor (and not Canctunian Ponius) to pay the 1000-drake pledge, you get both the reward for the quest and also the remaining embezzled gold (Canctunian Ponius will, however, thank you for returning the embezzled funds when asked).
Returning to Iulus Truptor without the money will cause his disposition towards you to drop by ten points.
If you have previously met Sinyaramen on the Blood Ties quest, he will accuse you of being a vampire and refuse to speak with you (even if you have subsequently completed A Cure for Vampirism). This can make it more difficult to locate Mossanon, but the quest can still be completed after you find him. Simply speak to Iniel or a Dark Elf female in Sadrith Mora.
There's no way of obtaining the IC14_Mossanon quest update.
However much gold you give to Ponius (if you give him any at all), it will not be on his body if he is killed.

Quest Stages