《旧唐书·本纪·卷十一》
五月十九日，立为皇太子，改名为豫。
四月庚寅，立为皇太子，改名豫。
On May 19, he was established as the crown prince and his name was changed to Yu.
<s>[INST] Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 四月庚寅，立为皇太子，改名豫。 Updated: 五月十九日，立为皇太子，改名为豫。 [/INST] On May 19, he was established as the crown prince and his name was changed to Yu.</s>
Take each pair of old and new sentences and unite them into a single translation that captures the core meaning: Archaic: 四月庚寅，立为皇太子，改名豫。 Updated: 五月十九日，立为皇太子，改名为豫。
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On May 19, he was established as the crown prince and his name was changed to Yu.
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