She was described as beautiful, spirited and courageous, while her influence over her spouse was, coupled with ambition, attributed to have involved her husbands in many wars.
Bertha is also known for her curious correspondence to Caliph al-Muktafi in 906, in which she described herself rather grandly as "Queen of the Franks."
Bertha's letter is of interest in that she appears to have little knowledge of Baghdad politics or culture, and it is for this reason that details of her correspondence were recorded by one of the Muslim chroniclers.
Moreover, the letter was written in a language unfamiliar to the Caliph's translators, and the accompanying gifts (among them a multicoloured woollen coat) which no doubt indicated largesse on Bertha's part, were unlikely to have impressed al-Muktafi beyond their novelty value.
[2] After the death of Adalbert II in 915, her son Guy became count and duke of Lucca and margrave of Tuscany.