Most narratives about the events during the Umayyad rule come from sources that were compiled during the succeeding Abbasid rule. Since the Abbasids came to power through armed insurrection against the Umayyad government, it is possible that certain biases may have crept in narratives written during their rule. One way to answer this question is to look at older Arabic sources, or look at third party information, for example Byzantine writings describing the events in Syria after the fall of Damascus.
I am looking for primary sources from the time of the Umayyad reign (i.e. 750 CE or earlier). Are there things like manuscripts or books compiled during this time, royal archives, letters sent to foreign powers like the Byzantines, travelogues of this time etc? Basically, any sources of information about the Umayyad rule, administration, and civil strife etc. that did not come to us from historians or scholars living in the succeeding Abbasid rule. Such sources could even be from Andalusia where the vestiges of Umayyad rule survived a little longer.
I have heard about a controversial personal diary of an Andalusian governor (Hurr), called "Tazkirah Hurr ibn Abdul Rahman", but I am unable to find whether it is real, where it exists (manuscript or copies) or any academic description.
Disclaimer: Cross-posted from https://islam.stackexchange.com/q/20276/10523