唐宣宗李忱（810年—859年），汉族，唐朝第十六位皇帝（除武则天和殇帝李重茂外）（846年—859年在位），唐宪宗李纯第十三子，穆宗李恒异母弟。初名李怡，长庆元年（821年），封光王。
会昌六年（846年），唐武宗病危，宦官马元贽等认为易于控制，就把他立为皇太叔，并更名为李忱，他便继位称帝，是为唐宣宗。性格明察沉断，用法无私，从谏如流，重惜官赏恭谨节俭惠爱民物，所以直至唐亡，百姓仍思咏他，将其称为“小太宗”。
大中之治
在即位后不久，他便开始勤于政事孜孜求治。他特别喜欢读《贞观政要》，并将其书于屏风之上，每每正色拱手拜读。这本书是由高祖时期制定的政治典籍，对后世有极大的影响。在他的治理下，不仅整顿了吏治，还限制了皇亲和宦官的权力。他把死于甘露之变中的除郑注、李训之外的百官全部昭雪，这显示出他对公平正义的重视。
对外关系方面，在他的统治期间，他不断击败吐蕃、回鹘、党项、奚人，并收复安史之乱后被吐蕃占领的失地，使得国势有所起色。因此，他在历史上被评价非常高，被认为是与文景之治的汉文帝和贞观之治的唐太宗一样的大明君。
简介
早年的经历
原名李怡，因父征战而未曾见过父亲，最终因母亲郑氏入宫侍奉郭太后而生，因此也算得上是一个出身微末的人。但由于其兄长们都早已去世或无嗣，使得这位默默无闻的小男孩成为了继承人之一。
登基与改革
当武宗驾崩时，由于宦官马元贽等人的推荐，他以皇太叔身份继承了皇位，即成为第二十四任 emperor of Tang Dynasty, also known as Emperor Taizu. During his reign, he reformed the government and strengthened the central authority. He reduced the power of eunuchs and promoted talented officials to key positions.
He also encouraged agriculture and commerce, which led to a period of economic prosperity in China during his reign.
In addition to these reforms, Li Cunxu was known for his cultural achievements. He patronized Confucian scholars and encouraged learning and education. His court attracted many poets and scholars who contributed to Chinese literature.
Li Cunxu's rule is considered one of the most successful periods in Chinese history. However, his life was cut short when he died at age 36 due to illness or poisoning.
Legacy
Li Cunxu's legacy has been remembered as an ideal ruler who brought peace and prosperity back to China after years of war and chaos under previous rulers. His reforms were seen as crucial steps towards a more stable society with a strong centralized government.
His reign is often compared with that of Emperor Taizong (Li Shimin), another great ruler from the Tang dynasty who expanded China's borders through military campaigns but also fostered culture by promoting Buddhism, Taoism, art, architecture etc... Both emperors are highly regarded for their leadership qualities such as wisdom in governance; courage on battlefield; tolerance towards other religions/beliefs; ability to attract talent from diverse backgrounds into their administration & support arts/culture development within society.
The impact of Li Cunxu's policies can still be seen today in modern-day China where they serve as an example for good governance & political stability even though it may have had some limitations due mainly because it lasted only 13 years before being interrupted by internal strife leading up eventually down fall
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