Okay, one thing always bugged me about King Hlaalu Helseth's anti-slavery law passed around the time of the Oblivion Crisis.

According to the rumours in Oblivion, he ganged up with Great House Dres to pull that one off against House Indoril's will.

Of all Houses, why the Dres? The guys depending on slavery the most to run their plantations in Deshaan? The guys renowned for trading slaves to the Telvanni and the other Houses of Morrowind?

Is there any good explanation out there, apart from "maybe some dominant faction within the Dres were opportunistic enough to follow Helseth's plan"?