## 3 Results and Discussion
The Al\({}_{2}\)O\({}_{3}\) content varies between 1.6 and 4.6 wt% with a mean value of 2.7 \(\pm\) 0.6 wt% and the CaO between 4.4 and 9.2 wt% with a mean value of 7 \(\pm\) 1 wt%. Additionally, the Fe\({}_{2}\)O\({}_{3}\) content ranges from 0.2 to 2.7 wt%, the TiO\({}_{2}\) from 0.09 to 0.6 wt% and MnO from 0.1 to 1.7 wt%. The respective mean values are 1.1 \(\pm\) 0.5 wt% for Fe\({}_{2}\)O\({}_{3}\), 0.2 \(\pm\) 0.1 wt% for TiO\({}_{2}\) and 1.1 \(\pm\) 0.4 wt% for MnO. The chemical composition of the moils shows SiO\({}_{2}\) content ranging from 64.6 to 74.9 wt% with a mean value of 69 \(\pm\) 3 wt%, Na\({}_{2}\)O from 10.1 to 21.5 wt% with a mean value of 13 \(\pm\) 3 wt%, and K\({}_{2}\)O and MgO from 0.6 to 1.7 wt% with a mean value of 0.9 \(\pm\) 0.3 wt%, and from 1.1 to 1.3 with a mean value of 1.0 \(\pm\) 0.2 wt%, respectively, while the Al\({}_{2}\)O\({}_{3}\) content varies between 2.5 and 6.8 wt% with a mean value of 3 \(\pm\) 0.6 wt% and the CaO between 4.1 and 9.4 wt% with a mean value of 7 \(\pm\) 1 wt%. Additionally, the Fe\({}_{2}\)O\({}_{3}\) content ranges from 0.3 to 3.3 wt%, the TiO\({}_{2}\) from 0.2 to 0.3 wt% and MnO from 0.1 to 1.9 wt%. The respective mean values are 1.4 \(\pm\) 0.8 wt% for Fe\({}_{2}\)O\({}_{3}\), 0.2 \(\pm\) 0.1 wt% for TiO\({}_{2}\) and 1.3 \(\pm\) 0.5 wt% for MnO. All glass finds from Vasileos Irakleiou Street, 45, are classified as natron glasses based on low K\({}_{2}\)O and MgO concentrations of below 1.3 wt% (Figure 2). Natron is a relatively pure mineral source of soda containing low magnesia and potash content, showing that all the measured samples are silica-soda-line glasses and were produced according to the Roman glassmaking tradition employing natron as a flux [23,40]. The Vasileos Irakleiou Street, 45 chemical data for finished glass and moils allow a relatively clearcut subdivision of them in two groups based of Na\({}_{2}\)O and SiO\({}_{2}\) contents: the low Na\({}_{2}\)O (13 wt%) and high SiO\({}_{2}\) (at around 70 wt%) group YK1, and the inverse high Na\({}_{2}\)O (at around 19 wt%) and low SiO\({}_{2}\) (at around 66 wt%) group YK2, as shown in Figure 3.  
During the first millennium AD, there were major primary glass production centers in the Levant and Egypt, which produced different types of glasses. Among them we mention the Levantine I glass type, which was produced at Apollonia, Israel, 4-7 th centuries, and the HIMT glass type, produced from the 4 th century in Egypt [12,14]. In order to understand in which production center Vasileos Irakleiou Street, 45 glasses were produced, we used the ratios Al\({}_{2}\)O\({}_{3}\)/SiO\({}_{2}\) versus TiO\({}_{2}\)/Al\({}_{2}\)O\({}_{3}\) and Na\({}_{2}\)O/SiO\({}_{2}\) versus CaO/Al\({}_{2}\)O\({}_{3}\) (Figure 4) [9,10,41,42]. Figure 2: MgO vs. K\({}_{2}\)O contents of Vasileos Irakleiou Street, 45 glasses compared with [PERSON] et al., 2017 [23]. The high TiO\({}_{2}\) contents of the majority of Vasileos Irakleiou Street, 45 glasses suggest an Egyptian origin [10; 18]. Most of our samples (from both groups, YK1 and YK2) have ratios between 0.03 and 0.05 (Al\({}_{2}\)O\({}_{3}\)/SiO\({}_{2}\)) and 0.05 and 0.1 (TiO\({}_{2}\)/Al\({}_{2}\)O\({}_{3}\)): these, of group YK2, present high Na\({}_{2}\)O, MgO, MnO, and Fe\({}_{2}\)O\({}_{3}\) characteristic of Egyptian composition, for which production is generally dated to the sixth century, while the samples of group YK1 present low Na\({}_{2}\)O and, also, high MgO, MnO, and Fe\({}_{2}\)O\({}_{3}\). Figure 4: Al\({}_{2}\)O\({}_{3}\)/SiO\({}_{2}\) versus TiO\({}_{2}\)/Al\({}_{2}\)O\({}_{3}\) (**a**) and Na\({}_{2}\)O/SiO\({}_{2}\) versus CaO/Al\({}_{2}\)O\({}_{3}\) (**b**) of Vasileos Irakleiou Street, 45 glasses compared with bibliographic data [10; 13; 16; 17; 25]. Figure 3: Na\({}_{2}\)O vs. SiO\({}_{2}\) contents of Vasileos Irakleiou Street, 45 glasses compared with [PERSON] et al., 2017 [23].