Several months after receiving devastating news about the ruined state of Jerusalem during the month of Kislev, an opportunity finally arises for the royal cupbearer to present his plea in the month of Nisan. This gap in time is explained by the different calendar systems used by ancient rulers. While the kings of the surrounding nations counted the years of their reign starting from the month of Tishrei, Israelite kings counted from Nisan, accounting for the delay before the matter could be brought to the throne [רב סעדיה גאון]. The monarch presiding over the court is King Darius, though he is referred to by the name Artaxerxes. Rather than a personal name, Artaxerxes served as a general royal title for Persian kings, much like the title Pharaoh was used for Egyptian rulers [רש״י, מצודת ציון].
During a royal banquet, wine was brought out and placed before the king in the courtyard [רש״י, רלב״ג, מצודת דוד]. According to the strict protocol of the royal court, a junior servant was responsible for transporting the wine into the courtyard. However, it was the exclusive duty of the chief cupbearer to take the cup from the servant and personally serve the king [רש״י, אבן עזרא]. This highlights the cupbearer's intimate and active role in pouring and presenting the drink directly to the monarch [מלבי״ם].
In his position, the cupbearer was known for maintaining a pleasant and cheerful disposition. He never displayed sadness or frustration, a trait that endeared him to the king [רש״י, אבן עזרא, מצודת דוד, ביאור שטיינזלץ]. Beyond simple fondness, Persian monarchs strictly forbade their attendants from appearing gloomy. A sullen face could easily be interpreted as a sign of malice or treason, prompting the cupbearer to carefully maintain a warm and smiling appearance at all times [מלבי״ם].
A contrasting perspective offers a much more dramatic explanation for the sudden tension surrounding the cupbearer's appearance. Royal cupbearers were required to taste the wine before serving it to prove it was not poisoned. As a Jew, he initially hesitated to drink the wine of gentiles. The king immediately noticed this hesitation and grew deeply suspicious, viewing his servant as a potential threat. Realizing his life was in immediate mortal danger, the cupbearer quickly drank the wine. Following this intense encounter, he earned the title Tirshatha. This name is rooted in the Hebrew concept of permitting, as he permitted the drinking of gentile wine before kings in life-threatening situations [רב סעדיה גאון].